Dive into today’s quiz on fundamentals of organic chemistry—perfect for MDCAT & ECAT aspirants. I hope you enjoy learning here as much as I enjoy teaching. 🌟
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🔥 Ace MDCAT & ECAT MCQs Quiz: Master the Fundamentals of Organic Chemistry! 🔬💡 | Essential Insights on Basics like Homologous Series, Functional Group and Isomerism
1️⃣ Which of the following functional groups contains a nitrogen atom?
🟦 A. Alcohol
🟩 B. Ketone
🟪 C. Ester
🟨 D. Amide
2️⃣ A closed chain hydrocarbon with an alternate double bond is known as:
🟦 A. Aliphatic
🟩 B. Aromatic
🟪 C. Alicyclic
🟨 D. Carboxylic
3️⃣ Destructive distillation of coal gives coke, coal tar, coal gas and:
🟦 A. Natural gas
🟩 B. Ammonia liquor
🟪 C. Naphtha
🟨 D. Petroleum
4️⃣ Which of the following is hard and high ranked coal?
🟦 A. Peat
🟩 B. Lignite
🟪 C. Bituminous
🟨 D. Anthracite
5️⃣ The general formula of the homologous series of alcohol is:
🟦 A. CₙH₂ₙO
🟩 B. CₙH₂ₙ+₂O
🟪 C. CₙH₂ₙ₋₂O
🟨 D. CₙH₂ₙ+₁O
6️⃣ The number of five-membered and six-membered rings in C₆₀ Bucky ball are respectively:
🟦 A. 12 and 12
🟩 B. 5 and 15
🟪 C. 12 and 20
🟨 D. 40 and 20
7️⃣ Which of the following pairs of compounds represents isomerism?
🟦 A. C₂H₅-OH & C₃H₇OH
🟩 B. CH₃-OCH₃ & C₂H₅OH
🟪 C. C₂H₅CH₂Cl & C₃H₇CH₂Cl
🟨 D. CH₃NH₂ & CH₃CH₂NH₂
8️⃣ The nuisance of knocking can be reduced by the process:
🟦 A. Reforming
🟩 B. Refining
🟪 C. Distillation
🟨 D. Condensation
9️⃣ Which of the following hydrocarbons is the chief constituent of natural gas?
🟦 A. CH₄
🟩 B. C₂H₆
🟪 C. C₃H₈
🟨 D. C₄H₁₀
🔟 Urea was first synthesized by Wohler from an inorganic material named as:
🟦 A. Ammonium nitrate
🟩 B. Ammonium chloride
🟪 C. Ammonium bicarbonate
🟨 D. Ammonium cyanate
1️⃣1️⃣ Organic chemistry deals with:
🟦 A. All hydrocarbons
🟩 B. Hydrocarbons & their derivatives
🟪 C. All carbon compounds
🟨 D. All of them
1️⃣2️⃣ Urea was prepared by Wohler by boiling …………. with water:
🟦 A. Ammonium chloride
🟩 B. Ammonium sulphate
🟪 C. Ammonium cyanate
🟨 D. Ammonium cyanide
1️⃣3️⃣ The first organic compound prepared in the lab was synthesized from:
🟦 A. Methane
🟩 B. Ammonium cyanate
🟪 C. Urea
🟨 D. Glucose
1️⃣4️⃣ The first organic compound prepared in the lab is:
🟦 A. Methane
🟩 B. Acetic acid
🟪 C. Glucose
🟨 D. Urea
1️⃣5️⃣ Which of the following element is NOT present in organic compounds?
🟦 A. S
🟩 B. N
🟪 C. O
🟨 D. Si
1️⃣6️⃣ According to vital force theory, organic compounds can only be synthesized by:
🟦 A. Animals
🟩 B. Plants
🟪 C. Rocks
🟨 D. Both A & B
1️⃣7️⃣ The chemical formula of urea is:
🟦 A. (NH₄)₂CO
🟩 B. (NH₂)₄C
🟪 C. (NH₂)₂CO
🟨 D. (NH₄)₂CO₃
1️⃣8️⃣ The chemist who synthesized urea from ammonium cyanate was:
🟦 A. G.N. Lewis
🟩 B. Berzelius
🟪 C. Friedrich Wöhler
🟨 D. Kolbe
1️⃣9️⃣ Vital force theory was rejected by:
🟦 A. G.N. Lewis
🟩 B. Scientists of 20th century
🟪 C. Greek Philosophers
🟨 D. F. Wöhler
2️⃣0️⃣ Which one is an organic compound?
🟦 A. KCN
🟩 B. CS₂
🟪 C. NH₄OCN
🟨 D. None of these
2️⃣1️⃣ Which one is an organic compound?
🟦 A. NaCNS
🟩 B. CO
🟪 C. KHCO₃
🟨 D. None of these
2️⃣2️⃣ All the compounds are inorganic except:
🟦 A. CaCO₃
🟩 B. NH₄CNO
🟪 C. CaC₂
🟨 D. (NH₂)₂CO
2️⃣3️⃣ All compounds are organic except:
🟦 A. (NH₂)₂CO
🟩 B. CH₃NO₂
🟪 C. NH₄CNO
🟨 D. C₂H₅N₂HSO₄
2️⃣4️⃣ The word “organic” means:
🟦 A. Full of life
🟩 B. Half life
🟪 C. Life or living
🟨 D. Lifeless
2️⃣5️⃣ The word “inorganic” means:
🟦 A. Full of life
🟩 B. Half life
🟪 C. Life or living
🟨 D. Lifeless
2️⃣6️⃣ Organic chemistry was founded by:
🟦 A. Grignard
🟩 B. Berzelius
🟪 C. Wöhler
🟨 D. Hofmann
2️⃣7️⃣ The diversity of organic compounds in millions is:
🟦 A. Four
🟩 B. Five
🟪 C. Six
🟨 D. Seven
2️⃣8️⃣ Father of organic chemistry is:
🟦 A. Faraday
🟩 B. Hofmann
🟪 C. Wöhler
🟨 D. Democritus
2️⃣9️⃣ In Bucky balls, the smallest molecule known contains ………..carbon atoms:
🟦 A. 70
🟩 B. 60
🟪 C. 20
🟨 D. 30
3️⃣0️⃣ Bucky balls are hollow spheres made up entirely of carbon atoms that have a diameter of approximately:
🟦 A. One nanometer
🟩 B. Ten nanometers
🟪 C. Five nanometers
🟨 D. Two nanometers
3️⃣1️⃣ Bucky balls have a high melting point of:
🟦 A. 2800°C
🟩 B. 3800°C
🟪 C. 1800°C
🟨 D. 2600°C
3️⃣2️⃣ Which of the following carbon compounds is not studied in organic chemistry?
🟦 A. Cyanates
🟩 B. Thiocyanates
🟪 C. Metal carbonyls
🟨 D. All of them
3️⃣3️⃣ Which of the following carbon compounds is not studied in organic chemistry?
🟦 A. Carbides
🟩 B. Cyanides
🟪 C. Carbonates
🟨 D. All of them
3️⃣4️⃣ Caffeine is obtained from tea, cocoa, and coffee beans and is used as:
🟦 A. CNS Stimulant
🟩 B. Anti-inflammatory drug
🟪 C. Treatment of fragility
🟨 D. Antacid
3️⃣5️⃣ Bromelain is obtained from pineapple and acts as:
🟦 A. CNS Stimulant
🟩 B. Anti-inflammatory drug
🟪 C. Treatment of fragility
🟨 D. Antacid
3️⃣6️⃣ Rutin is obtained from lemon, orange, grapefruit, etc., and it aids in the:
🟦 A. CNS Stimulant
🟩 B. Anti-inflammatory drug
🟪 C. Treatment of fragility
🟨 D. Antacid
3️⃣7️⃣ Which gas is used in the ripening of fruits?
🟦 A. Ethene
🟩 B. Ethane
🟪 C. Benzene
🟨 D. None of them
3️⃣8️⃣ Which is used as a preservative of biological specimens?
🟦 A. Formalin
🟩 B. Ethene
🟪 C. Benzene
🟨 D. Ethyne
3️⃣9️⃣ Which is used as an antifreeze and coolant in automobiles?
🟦 A. Ethylene glycol
🟩 B. Ethene
🟪 C. Glycerin
🟨 D. Benzene
4️⃣0️⃣ Which is used as an antiseptic and ink preservative?
🟦 A. Phenol
🟩 B. Acetone
🟪 C. Ether
🟨 D. Ethanol
4️⃣1️⃣ Which is used as a nail polish remover?
🟦 A. Acetone
🟩 B. Ethene
🟪 C. Ether
🟨 D. Ethanol
4️⃣2️⃣ Which is used as an anesthesia?
🟦 A. Diethyl ether
🟩 B. Ethane
🟪 C. Ether
🟨 D. Ethanol
4️⃣3️⃣ The condensation polymerization of terephthalic acid (a dicarboxylic acid) with ethylene glycol (a diol) gives:
🟦 A. Phenol
🟩 B. Polyethylene terephthalate
🟪 C. Formaldehyde
🟨 D. Bakelite
4️⃣4️⃣ Terephthalic acid is a:
🟦 A. Dicarboxylic acid
🟩 B. Diamine
🟪 C. Diol
🟨 D. Dialdehyde
45️⃣ In 1985, Richard Smalley & Harry Kroto introduced a new allotropic form of carbon that consists of:
🟦 A. 60 carbons
🟩 B. 50 carbons
🟪 C. 70 carbons
🟨 D. 10 carbons
4️⃣6️⃣ The production of the anti-inflammatory drug, ibuprofen, from a compound called cumene is an example of:
🟦 A. Partial synthesis
🟩 B. Total synthesis
🟪 C. Mixed synthesis
🟨 D. All of them
4️⃣7️⃣ The process of synthesizing a complex target organic molecule directly from a partially synthesized intermediate compound or readily available natural product is called:
🟦 A. Partial synthesis
🟩 B. Total synthesis
🟪 C. Mixed synthesis
🟨 D. All of them
4️⃣8️⃣ During the partial synthesis of the anti-inflammatory drug, ibuprofen, cumene undergoes several chemical transformations, including:
🟦 A. Oxidation
🟩 B. Rearrangement
🟪 C. Both of them
🟨 D. Reduction
4️⃣9️⃣ The process of synthesizing a complex target organic molecule, typically a natural product, from simple starting materials using a stepwise series of chemical reactions is known as:
🟦 A. Total synthesis
🟩 B. Partial synthesis
🟪 C. Mixed synthesis
🟨 D. Both A and C
5️⃣0️⃣ The preparation of the anti-cancer drug, paclitaxel (Taxol), is an example of:
🟦 A. Total synthesis
🟩 B. Partial synthesis
🟪 C. Mixed synthesis
🟨 D. Both A and C
5️⃣1️⃣ Ethyl alcohol is commercially manufactured by ___________ process of starchy materials using certain enzymes secreted by microorganisms (yeast).
🟦 A. Fermentation
🟩 B. Hydrolysis
🟪 C. Oxidation
🟨 D. Combustion
5️⃣2️⃣ Which natural source is being depleted by the manufacture of plastics?
🟦 A. Metal ores
🟩 B. Water
🟪 C. Fossil fuels
🟨 D. Air
5️⃣3️⃣ Octane is an alkane present in petrol. What are the products when octane burns completely in air?
🟦 A. CO₂ and water
🟩 B. Petroleum
🟪 C. Natural gas
🟨 D. All of them
5️⃣4️⃣ Which compound on combustion never forms soot?
🟦 A. Ethanol
🟩 B. Carbon monoxide
🟪 C. Ethene
🟨 D. Methane
5️⃣5️⃣ Organic compounds are soluble in:
🟦 A. Alkalis
🟩 B. Polar solvents
🟪 C. Non-polar solvents
🟨 D. Water
5️⃣6️⃣ Which reagent is used to synthesize methane in the laboratory using a Ni catalyst at high temperature and moderate pressure?
🟦 A. CO and H₂
🟩 B. CO₂ and H₂
🟪 C. CO and H₂O
🟨 D. CO₂ and H₂O
5️⃣7️⃣ The general formula of starch is:
🟦 A. (CH₂O)n
🟩 B. (C₆H₁₀O₅)n
🟪 C. (C₆H₁₂O₆)n
🟨 D. (C₄H₆O₂)n
5️⃣8️⃣ The characteristic reactions of alkenes are:
🟦 A. Polymerization
🟩 B. Addition
🟪 C. Substitution
🟨 D. Elimination
5️⃣9️⃣ Hydrocarbon which is liquid at room temperature is:
🟦 A. Hexane
🟩 B. Butane
🟪 C. Ethane
🟨 D. Propane
6️⃣0️⃣ Which molecule has a tetrahedral shape?
🟦 A. CH₂=CH₂
🟩 B. CH₃-CH₃
🟪 C. CH≡CH
🟨 D. None
6️⃣1️⃣ Which process increases the octane number of gasoline by converting straight-chain to branched-chain hydrocarbons?
🟦 A. Cracking
🟩 B. Reforming
🟪 C. Refining
🟨 D. Distillation
6️⃣2️⃣ The main source of alkanes is:
🟦 A. Coal gas
🟩 B. Petroleum
🟪 C. Coal tar
🟨 D. Natural gas
6️⃣3️⃣ Coal is primarily a source of:
🟦 A. Alkanes
🟩 B. Aromatic hydrocarbons
🟪 C. Fatty acids
🟨 D. Proteins
6️⃣4️⃣ Which of the following is a biopolymer?
🟦 A. Nylon-6
🟩 B. Polyester
🟪 C. Cellulose
🟨 D. Bakelite
6️⃣5️⃣ Each carbon atom in C₆₀ is:
🟦 A. sp hybridized
🟩 B. sp² hybridized
🟪 C. sp³ hybridized
🟨 D. Unhybridized
6️⃣6️⃣ Which of the following is an example of total synthesis?
🟦 A. Converting cholesterol to cortisone
🟩 B. Preparing urea from ammonium cyanate
🟪 C. Converting morphine to codeine
🟨 D. Preparing aspirin from salicylic acid
6️⃣7️⃣ Which one of the following statements is incorrect regarding alicyclic compounds?
🟦 A. Contains rings of three or more carbons
🟩 B. Resemble aliphatic compounds
🟪 C. Pyrrole is their example
🟨 D. Obey the general formula of alkenes or alkynes
6️⃣8️⃣ Which one of the following pair of functional groups is not an oxygen-containing functional group?
🟦 A. Aldehydic and ketonic group
🟩 B. Carboxyl and ester group
🟪 C. Hydroxylic and amino group
🟨 D. Amide and acid halide group
6️⃣9️⃣ Which one of the following properties is not the same for all the members of a homologous series?
🟦 A. Chemical behaviour
🟩 B. General formula and functional group
🟪 C. Methods of preparation
🟨 D. Physical properties
7️⃣0️⃣ Methane is used as a fuel. What property is essential for this use?
🟦 A. It is a gas
🟩 B. It burns exothermically
🟪 C. It has a low boiling point
🟨 D. It is odourless
7️⃣1️⃣ Pentyl group (C₅H₁₁–) has:
🟦 A. 8 isomers
🟩 B. 6 isomers
🟪 C. 12 isomers
🟨 D. 4 isomers
7️⃣2️⃣ Pentyl group (C₅H₁₁–) has the following 8 isomers. The number of primary, secondary, and tertiary isomers are respectively:
🟦 A. 4, 3, 1
🟩 B. 3, 4, 1
🟪 C. 2, 4, 2
🟨 D. 1, 4, 3
7️⃣3️⃣ Tert-butyl group is also called:
🟦 A. Neo-butyl
🟩 B. Sec-butyl
🟪 C. N-butyl
🟨 D. Iso-butyl
7️⃣4️⃣ The general formula of acid amides is:
🟦 A. CₙH₂ₙ₊₁…CONH₂
🟩 B. CₙH₂ₙ₊₁…NH₂
🟪 C. CₙH₂ₙ₊₁…CONHR
🟨 D. None of them
7️⃣5️⃣ The general formula of thioether is:
🟦 A. CₙH₂ₙ₊₁…SR
🟩 B. CₙH₂ₙ₊₁…OR
🟪 C. CₙH₂ₙ₊₁…SOR
🟨 D. None of these
7️⃣6️⃣ Polycyclic aromatic hydrocarbons have benzene rings:
🟦 A. Two
🟩 B. Two condensed rings
🟪 C. More than one ring
🟨 D. One
7️⃣7️⃣ Iso-pentyl and iso-amyl pentyl groups are examples of:
🟦 A. Primary groups
🟩 B. Secondary groups
🟪 C. Tertiary groups
🟨 D. None of them
7️⃣8️⃣ Aromatic hydrocarbons characterized by a cyclic arrangement of carbon atoms in the form of a hexagonal ring of six carbon atoms connected by alternating double bonds called benzene ring generally follow the:
🟦 A. Hückel rule
🟩 B. (4n+2π electrons) rule
🟪 C. Both of them
🟨 D. None of them
7️⃣9️⃣ Which one is the imino group?
🟦 A. >C=N–H
🟩 B. >C=NH
🟪 C. >C=N–R
🟨 D. –C≡N
8️⃣0️⃣ Which one is the acid amide group?
🟦 A. C–NH₂
🟩 B. C(=O)–NH₂
🟪 C. C(=O)–NR
🟨 D. None of these
8️⃣1️⃣ Which one is the nitrile group?
🟦 A. C=N–H
🟩 B. C=NH
🟪 C. C≡N
🟨 D. C≡N–R
8️⃣2️⃣ Which one is called biphenyl?
🟦 A.
🟩 B.
🟪 C.
🟨 D. None of them
8️⃣3️⃣ Which one is called diphenylmethane?
🟦 A.
🟩 B.
🟪 C.
🟨 D. None of them
8️⃣4️⃣ Monocyclic aromatic hydrocarbons have benzene rings:
🟦 A. Two isolated rings
🟩 B. Two condensed rings
🟪 C. Two
🟨 D. One
8️⃣5️⃣ The formula of ortho-xylene is:
🟦 A.
🟩 B.
🟪 C.
🟨 D. None of them
8️⃣6️⃣ The formula of meta-xylene is:
🟦 A.
🟩 B.
🟪 C.
🟨 D. None of them
8️⃣7️⃣ The formula of para-xylene is:
🟦 A.
🟩 B.
🟪 C.
🟨 D. None of them
8️⃣8️⃣ The formula of benzotrichloride is:
🟦 A.
🟩 B.
🟪 C.
🟨 D. None of them
8️⃣9️⃣ The formula of benzyl chloride is:
🟦 A.
🟩 B.
🟪 C.
🟨 D. None of them
9️⃣0️⃣ The formula of benzal chloride is:
🟦 A.
🟩 B.
🟪 C.
🟨 D. None of them
9️⃣1️⃣. 
It is called ?
🟦 A. Alkylbenzene
🟩 B. Acylbenzene
🟪 C. Benzoylbenzene
🟨 D. Vinylbenzene
9️⃣2️⃣. –C≡C– is the functional group of?
🟦 A. Alkanes
🟩 B. Alkenes
🟪 C. Alkynes
🟨 D. Benzene
9️⃣3️⃣. How many secondary carbon atoms does methylcyclopropane have?
🟦 A. One
🟩 B. Two
🟪 C. Three
🟨 D. None
9️⃣4️⃣. Compound having open chain is:
🟦 A. Pentane
🟩 B. Isopentane
🟪 C. Neopentane
🟨 D. All of them
9️⃣5️⃣. Which is an acyclic compound?
🟦 A. Methane
🟩 B. Benzene
🟪 C. Pyrrole
🟨 D. Cyclobutane
9️⃣6️⃣. The total number of secondary H-atoms in this structure (CH₃)₂CHCH₂C₂H₅ are:
🟦 A. 1
🟩 B. 4
🟪 C. 3
🟨 D. 2
9️⃣7️⃣. Carbon free radicals are:
🟦 A. Diamagnetic
🟩 B. Paramagnetic
🟪 C. Ferromagnetic
🟨 D. Non-magnetic
9️⃣8️⃣. Which one of the following compounds is heterocyclic?
🟦 A. Aniline
🟩 B. Anthracene
🟪 C. Pyridine
🟨 D. Phenol
9️⃣9️⃣. Which of the following radicals are bivalent?
🟦 A. Ethylidene
🟩 B. Vinylidene
🟪 C. Benzyl
🟨 D. Methylidyne
(a) A, D
(b) A, B, D
(c) A, B
(d) A, B, C
1️⃣0️⃣0️⃣. The formula of aniline is:
🟦 A. C₆H₅
🟩 B. C₆H₅–NH–C₆H₅
🟪 C. C₆H₅–NH₂
🟨 D. C₆H₅–NO₂
1️⃣0️⃣1️⃣. Which of the following pairs of homologous series is represented by the general molecular formula CₙH₂ₙ₋₂?
🟦 A. Alkene & alkyne
🟩 B. Alkyne and alkadiyne
🟪 C. Alkane & alkadiene
🟨 D. Alkyne & alkadiene
1️⃣02️⃣. The general formula of cycloalkene is:
🟦 A. CₙH₂ₙ
🟩 B. CₙH₂ₙ+₂
🟪 C. CₙH₂ₙ-₁
🟨 D. CₙH₂ₙ₋₂
1️⃣0️⃣3️⃣. The formula of cyclopropane is:
🟦 A. C₃H₈
🟩 B. C₃H₄
🟪 C. C₃H₅
🟨 D. C₃H₆
1️⃣0️⃣4️⃣. The formula of cyclopropene is:
🟦 A. C₃H₈
🟩 B. C₃H₄
🟪 C. C₃H₅
🟨 D. C₃H₆
1️⃣0️⃣5️⃣. The compound in which two alkyl groups are attached to the carbonyl group is called:
🟦 A. Alcohol
🟩 B. Aldehyde
🟪 C. Ketone
🟨 D. Ether
1️⃣0️⃣6️⃣. Carbonyl group is present in:
🟦 A. Aldehyde
🟩 B. Ketone
🟪 C. Alcohols
🟨 D. both a and b
1️⃣0️⃣7️⃣. The chemical formula of urea is:
🟦 A. (NH₄)₂CO
🟩 B. (NH₂)₄C
🟪 C. (NH₄)₂CO₃
🟨 D. (NH₂)₂CO
1️⃣0️⃣8️⃣. Urea belongs to which class of compounds?
🟦 A. Imides
🟩 B. Carboxylic acid
🟪 C. Amides
🟨 D. Amines
1️⃣0️⃣9️⃣. In t-butyl alcohol, the tertiary carbon is bonded to:
🟦 A. 3 hydrogen atoms
🟩 B. 2 hydrogen atoms
🟪 C. One hydrogen atom
🟨 D. No hydrogen atom
1️⃣1️⃣0️⃣. In t-butyl alcohol, the tertiary carbon is bonded to:
🟦 A. One carbon atom
🟩 B. Two carbon atoms
🟪 C. Three carbon atoms
🟨 D. No carbon atom
1️⃣1️⃣1️⃣. IUPAC name of iso-octane is:
🟦 A. 2,4,4-trimethylpentane
🟩 B. 2,2,4-trimethylpentane
🟪 C. 2,2,4-trimethylhexane
🟨 D. 2,2,4-trimethyloctane
1️⃣1️⃣2️⃣. Pyridine belongs to which class of organic compounds?
🟦 A. Heterocyclic
🟩 B. Alicyclic
🟪 C. Hydrocarbon
🟨 D. Homocyclic
1️⃣1️⃣3️⃣. Ether functional group can be represented as:
🟦 A. –OH
🟩 B. R–CO–R
🟪 C. R–O–R
🟨 D. R–CO–O–CO–R
1️⃣1️⃣4️⃣. A single atom or group of atoms which imparts characteristic properties to a compound is called:
🟦 A. Radical
🟩 B. Functional group
🟪 C. Ion
🟨 D. Free radical
1️⃣1️⃣5️⃣. Hydrocarbons which burn with smoky flame are called:
🟦 A. Aliphatic
🟩 B. Aromatic
🟪 C. Alicyclic
🟨 D. Acyclic
1️⃣1️⃣6️⃣. Which of the following is an amide?
🟦 A. R–NH₂
🟩 B. RCONH₂
🟪 C. R–NH–R
🟨 D. C₆H₅NH₂
1️⃣1️⃣7️⃣. Homologues of alkanes differ from each other by:
🟦 A. Methylidene group
🟩 B. Methyldiyne group
🟪 C. Ethylidiene group
🟨 D. Ethylidyne group
1️⃣1️⃣8️⃣. Which is not a heterocyclic compound?
🟦 A. Furan
🟩 B. Pyrrole
🟪 C. Aniline
🟨 D. Thiophene
1️⃣1️⃣9️⃣. Which of the following is an aromatic compound?
🟦 A. Aniline
🟩 B. Cyclobutane
🟪 C. Cyclohexanol
🟨 D. Neopentane
1️⃣2️⃣0️⃣. Which of the following is the structure of isobutyl alkyl radical?
🟦 A.
🟩 B.
🟪 C.
🟨 D.
1️⃣2️⃣1️⃣. When hydrogen is removed from alkane, the product obtained has the general formula:
🟦 A. CₙH₂ₙ+₂
🟩 B. CₙH₂ₙ₋₂
🟪 C. CₙH₂ₙ+₁
🟨 D. CₙH₂ₙ₋₁
1️⃣2️⃣2️⃣. When organic compounds contain more than one functional group, it is known as:
🟦 A. Polymer
🟩 B. Polyfunctional
🟪 C. Isomers
🟨 D. Derivatives
1️⃣2️⃣3️⃣. Which of the following is functional group of ester?
🟦 A. ‒COOH
🟩 B. ‒CHO
🟪 C. ‒COOR
🟨 D. ‒COR
1️⃣2️⃣4️⃣. The compound in which two alkyl groups are attached to carbonyl group is called:
🟦 A. Ketone
🟩 B. Ether
🟪 C. Aldehyde
🟨 D. Esters
1️⃣2️⃣5️⃣. Carbonyl group is present in:
🟦 A. Aldehyde
🟩 B. Ketone
🟪 C. Alcohols
🟨 D. Both A and B
1️⃣2️⃣6️⃣. Which of the following alkanes contains primary, secondary, tertiary & quaternary carbon atom together?
🟦 A. (CH₃)₃CH
🟩 B. (C₂H₅)₃CH
🟪 C. (CH₃)₃CCH₂CH(CH₃)₂
🟨 D. (CH₃)₄C
1️⃣2️⃣7️⃣. The presence of pi bond in a molecule is the sign of:
🟦 A. Unsaturation
🟩 B. Inertness
🟪 C. Stability
🟨 D. Saturation
1️⃣2️⃣8️⃣. Which one of the following is NOT a heterocyclic compound?
🟦 A. Thiophene
🟩 B. Anthracene
🟪 C. Quinolone
🟨 D. Furan
1️⃣2️⃣9️⃣. Which one of the following compounds is heterocyclic?
🟦 A. Anthracene
🟩 B. Phenol
🟪 C. Furan
🟨 D. Aniline
1️⃣3️⃣0️⃣. The formula of aniline is:
🟦 A. C₆H₅-NH-C₆H₅
🟩 B. C₆H₅
🟪 C. C₆H₅-NH₂
🟨 D. C₆H₅-CO-C₆H₅
1️⃣3️⃣1️⃣. Number of primary carbon atoms in the given compound is:
🟦 A. 5
🟩 B. 6
🟪 C. 4
🟨 D. 2
1️⃣3️⃣2️⃣. How many quaternary hydrogen is possible in alkane?
🟦 A. 1
🟩 B. 2
🟪 C. 3
🟨 D. 0
1️⃣3️⃣3️⃣. Which one of the following is the correct structural formula of toluene?
🟦 A.
🟩 B.
🟪 C.
🟨 D.
1️⃣3️⃣4️⃣. The formula of cyclobutene is:
🟦 A. C₄H₈
🟩 B. C₄H₄
🟪 C. C₄H₅
🟨 D. C₄H₆
1️⃣3️⃣5️⃣. The number of hydrogen atoms in an alkene with 'n' carbon atoms is:
🟦 A. ‘n’
🟩 B. ‘2n-2’
🟪 C. ‘2n’
🟨 D. None of them
1️⃣3️⃣6️⃣. The general formula of arenes is:
🟦 A. CₙH₂ₙ₊₆ₘ
🟩 B. CₙH₂ₙ-₃ₘ
🟪 C. CₙH₂ₙ₋₆
🟨 D. CₙH₂ₙ₋₆ₘ
1️⃣3️⃣7️⃣. CₙH₂ₙ is the general formula of:
🟦 A. Cycloalkanes
🟩 B. Alkenes
🟪 C. Alkynes
🟨 D. Both A and B
1️⃣3️⃣8️⃣. Alkanes containing carbons C-18 onwards are:
🟦 A. Gases
🟩 B. Liquids
🟪 C. Waxy solids
🟨 D. Solids
1️⃣3️⃣9️⃣. Alkanes are soluble in all except:
🟦 A. Benzene
🟩 B. Carbon tetrachloride
🟪 C. Water
🟨 D. Ether
1️⃣4️⃣0️⃣. The property of an alkane which does NOT increase with increase in molar mass:
🟦 A. Boiling point
🟩 B. Melting point
🟪 C. Density
🟨 D. Solubility
Answer Key & Detailed Explanations 🔑📚: Unraveling the Mysteries of Organic Chemistry MCQs
1️⃣ 🟨 D (Amide)
Explanation: Amides contain a nitrogen atom as part of their structure.
2️⃣ 🟪 C (Alicyclic)
Explanation: A closed chain hydrocarbon with alternate double bonds is called an alicyclic compound.
3️⃣ 🟩 B (Ammonia liquor)
Explanation: Destructive distillation of coal produces ammonia liquor along with coke, coal tar, and coal gas.
4️⃣ 🟨 D (Anthracite)
Explanation: Anthracite is the hardest and highest-ranked coal, formed from high-pressure and heat.
5️⃣ 🟩 B (CₙH₂ₙ+₂O)
Explanation: Alcohols follow the general formula CₙH₂ₙ+₂O, where "n" is the number of carbon atoms.
6️⃣ 🟪 C (12 and 20)
Explanation: C₆₀ (Buckminsterfullerene) contains 12 five-membered rings and 20 six-membered rings.
7️⃣ 🟩 B (CH₃-OCH₃ & C₂H₅OH)
Explanation: These compounds represent structural isomerism (same molecular formula, different structures).
8️⃣ 🟦 A (Reforming)
Explanation: Reforming is a process that helps reduce engine knocking by increasing the octane number of gasoline.
9️⃣ 🟦 A (CH₄)
Explanation: Methane (CH₄) is the chief constituent of natural gas.
🔟 🟨 D (Ammonium cyanate)
Explanation: Urea was first synthesized by Friedrich Wöhler from ammonium cyanate in 1828, disproving vitalism.
1️⃣1️⃣ 🟪 C (All carbon compounds)
Explanation: Organic chemistry is the study of covalent compounds of carbon, usually containing hydrogen, oxygen, nitrogen, sulfur, and halogens, and includes all carbon compounds.
1️⃣2️⃣ 🟪 C (Ammonium cyanate)
Explanation: Urea was first synthesized by Wöhler by boiling ammonium cyanate with water, proving that organic compounds could be synthesized from inorganic materials.
1️⃣3️⃣ 🟩 B (Ammonium cyanate)
Explanation: The first organic compound, urea, was synthesized by Wöhler from ammonium cyanate, which was obtained through a double decomposition reaction.
1️⃣4️⃣ 🟨 D (Urea)
Explanation: Urea was the first organic compound prepared in the laboratory by Friedrich Wöhler in 1828, challenging the vital force theory.
1️⃣5️⃣ 🟨 D (Si)
Explanation: Organic compounds typically contain carbon, hydrogen, oxygen, nitrogen, sulfur, phosphorus, and halogens, but silicon (Si) is not a part of standard organic compounds.
1️⃣6️⃣ 🟨 D (Both A & B)
Explanation: According to the vital force theory, organic compounds could only be synthesized by living organisms such as animals and plants.
1️⃣7️⃣ 🟪 C (NH₂)₂CO
Explanation: The chemical formula for urea is (NH₂)₂CO, also called carbonyl diamide.
1️⃣8️⃣ 🟪 C (Friedrich Wöhler)
Explanation: Friedrich Wöhler synthesized urea from ammonium cyanate in 1828, which is regarded as the first organic compound synthesized in the lab.
1️⃣9️⃣ 🟩 B (Scientists of the 20th century)
Explanation: The vital force theory was rejected after Wöhler synthesized urea from inorganic compounds, and this rejection became widespread in the 20th century.
2️⃣0️⃣ 🟨 D (None of these)
Explanation: KCN, CS₂, and NH₄OCN are inorganic compounds. Metallic cyanides, carbon disulfide, and cyanates are not considered organic compounds.
2️⃣1️⃣ 🟨 D (None of these)
Explanation: Metallic cyanides, carbon monoxide, and bicarbonates are inorganic compounds. All options listed are inorganic compounds.
2️⃣2️⃣ 🟨 D (Urea)
Explanation: Urea, (NH₂)₂CO, is an organic compound, while the others like CaCO₃ and NH₄CNO are inorganic compounds.
2️⃣3️⃣ 🟪 C (NH₄CNO)
Explanation: NH₄CNO (ammonium cyanate) is an inorganic salt. The other compounds are organic.
2️⃣4️⃣ 🟪 C (Life or living)
Explanation: The word "organic" comes from the Greek term "organikos," which means "life" or "living." It was historically associated with compounds derived from living organisms.
2️⃣5️⃣ 🟨 D (Lifeless)
Explanation: "Inorganic" refers to compounds that are not derived from living organisms. These compounds are "lifeless" in nature.
2️⃣6️⃣ 🟩 B (Berzelius)
Explanation: Jöns Jacob Berzelius is credited with laying the foundation of organic chemistry through his work on organic compounds and their properties.
2️⃣7️⃣ 🟪 C (Six)
Explanation: The diversity of organic compounds is vast, with millions of compounds falling under six major families: alkanes, alkenes, alkynes, alcohols, acids, and amides.
2️⃣8️⃣ 🟪 C (Wöhler)
Explanation: Friedrich Wöhler is known as the father of organic chemistry for his groundbreaking synthesis of urea from inorganic materials, challenging the vital force theory.
2️⃣9️⃣ 🟩 B (60)
Explanation: In Bucky balls (C₆₀), the smallest known molecule consists of 60 carbon atoms, forming a stable spherical structure.
3️⃣0️⃣ 🟦 A (One nanometer)
Explanation: Bucky balls (C₆₀) have a diameter of approximately 1 nanometer, making them important in nanotechnology.
3️⃣1️⃣ 🟦 A (2800°C)
Explanation: Bucky balls (C₆₀) have a high melting point of approximately 2800°C due to the strong covalent bonds between carbon atoms.
3️⃣2️⃣ 🟨 D (All of them)
Explanation: Cyanates, thiocyanates, and metal carbonyls are inorganic compounds. These compounds lack essential carbon bonding patterns seen in organic compounds and are studied in inorganic chemistry.
3️⃣3️⃣ 🟨 D (All of them)
Explanation: Carbides, cyanides, and carbonates are not organic compounds. They are inorganic compounds due to their lack of a C–C bond and differing properties from organic compounds.
3️⃣4️⃣ 🟦 A (CNS Stimulant)
Explanation: Caffeine, found in tea, cocoa, and coffee, acts as a stimulant for the central nervous system (CNS), increasing alertness and reducing fatigue.
3️⃣5️⃣ 🟩 B (Anti-inflammatory drug)
Explanation: Bromelain, obtained from pineapple, is used as an anti-inflammatory drug. It helps reduce swelling and inflammation.
3️⃣6️⃣ 🟪 C (Treatment of fragility)
Explanation: Rutin, obtained from citrus fruits like lemon, orange, and grapefruit, aids in the treatment of fragility (weakness of blood vessels) and helps with circulation.
3️⃣7️⃣ 🟦 A (Ethene)
Explanation: Ethene (also called ethylene) is a plant hormone used in the ripening process of fruits by accelerating their maturation.
3️⃣8️⃣ 🟦 A (Formalin)
Explanation: Formalin, a solution of formaldehyde in water, is used as a preservative for biological specimens to prevent decay and bacterial growth.
3️⃣9️⃣ 🟦 A (Ethylene glycol)
Explanation: Ethylene glycol is used in automobiles as an antifreeze and coolant due to its ability to lower the freezing point of water.
4️⃣0️⃣ 🟦 A (Phenol)
Explanation: Phenol is used as an antiseptic for disinfecting and preserving ink and other substances due to its antibacterial properties.
4️⃣1️⃣ 🟦 A (Acetone)
Explanation: Acetone is commonly used as a nail polish remover due to its ability to dissolve most types of nail polish.
4️⃣2️⃣ 🟦 A (Diethyl ether)
Explanation: Diethyl ether is historically used as an anesthetic, though its use has decreased due to its flammability and potential for explosive decomposition.
4️⃣3️⃣ 🟩 B (Polyethylene terephthalate)
Explanation: The condensation polymerization of terephthalic acid with ethylene glycol gives polyethylene terephthalate (PET), a common polyester used in plastic bottles and textiles.
4️⃣4️⃣ 🟦 A (Dicarboxylic acid)
Explanation: Terephthalic acid is a dicarboxylic acid with two carboxyl groups (-COOH), used in the production of PET.
4️⃣5️⃣ 🟦 A (60 carbons)
Explanation: In 1985, Richard Smalley and Harry Kroto introduced a new allotropic form of carbon called fullerenes, specifically C₆₀, which consists of 60 carbon atoms.
4️⃣6️⃣ 🟦 A (Partial synthesis)
Explanation: The production of ibuprofen from cumene is an example of partial synthesis, where cumene undergoes chemical transformations to form ibuprofen.
4️⃣7️⃣ 🟦 A (Partial synthesis)
Explanation: Partial synthesis refers to synthesizing a complex molecule from a naturally occurring or partially synthesized intermediate.
4️⃣8️⃣ 🟪 C (Both of them)
Explanation: During the partial synthesis of ibuprofen, cumene undergoes oxidation and rearrangement reactions to form the final product.
4️⃣9️⃣ 🟦 A (Total synthesis)
Explanation: Total synthesis involves the stepwise construction of a complex molecule from simpler starting materials. This is commonly used in natural product synthesis.
5️⃣0️⃣ 🟦 A (Total synthesis)
Explanation: The preparation of paclitaxel (Taxol), an anti-cancer drug, is an example of total synthesis, which involves multiple chemical steps to construct the molecule from simpler building blocks.
5️⃣1️⃣ 🟦 A (Fermentation)
Explanation: Ethyl alcohol is commercially produced via fermentation, where yeast converts starchy materials into ethanol and carbon dioxide.
5️⃣2️⃣ 🟩 C (Fossil fuels)
Explanation: Plastics are made from petrochemicals derived from fossil fuels, leading to the depletion of these resources.
5️⃣3️⃣ 🟦 A (CO₂ and water)
Explanation: When octane (a component of petrol) burns completely in air, the products are carbon dioxide (CO₂) and water (H₂O).
5️⃣4️⃣ 🟪 C (Ethene)
Explanation: Ethene, when combusted, does not form soot because it undergoes complete combustion to produce CO₂ and H₂O.
5️⃣5️⃣ 🟪 C (Non-polar solvents)
Explanation: Organic compounds, which are typically non-polar, are soluble in non-polar solvents like benzene or hexane.
5️⃣6️⃣ 🟦 A (CO and H₂)
Explanation: Methane (CH₄) is synthesized in the lab by reacting carbon monoxide (CO) with hydrogen gas (H₂) in the presence of a nickel (Ni) catalyst.
5️⃣7️⃣ 🟩 B (C₆H₁₀O₅)n
Explanation: Starch is a polymer of glucose and its general formula is (C₆H₁₀O₅)n, where 'n' represents the number of glucose units in the polymer.
5️⃣8️⃣ 🟩 B (Addition)
Explanation: Alkenes undergo addition reactions due to the presence of a double bond, allowing them to add atoms or groups across the bond.
5️⃣9️⃣ 🟦 A (Hexane)
Explanation: Hexane, a six-carbon alkane, is a liquid at room temperature, while smaller alkanes like butane and propane are gases.
6️⃣0️⃣ 🟩 B (CH₃-CH₃)
Explanation: The molecule CH₃-CH₃ (ethane) has a tetrahedral shape due to the sp³ hybridization of the carbon atoms, leading to 109.5° bond angles.
6️⃣1️⃣ 🟩 B (Reforming)
Explanation: Reforming converts straight-chain alkanes (n-alkanes) into branched-chain alkanes (iso-alkanes) and aromatic hydrocarbons, which increases the octane number of gasoline.
6️⃣2️⃣ 🟩 B (Petroleum)
Explanation: Petroleum is the main source of alkanes, also known as paraffins, which are widely used in fuels like gasoline and diesel.
6️⃣3️⃣ 🟩 B (Aromatic hydrocarbons)
Explanation: Coal is rich in aromatic hydrocarbons, such as benzene, toluene, and xylene. Alkanes are mainly derived from petroleum.
6️⃣4️⃣ 🟪 C (Cellulose)
Explanation: Cellulose is a biopolymer made of glucose units, commonly found in plants. It is an example of a natural polymer, unlike synthetic polymers such as nylon and polyester.
6️⃣5️⃣ 🟩 B (sp² hybridized)
Explanation: In C₆₀ (buckminsterfullerene), each carbon atom forms three sigma bonds with other carbons and has one delocalized π-electron, similar to the bonding in graphite, which involves sp² hybridization.
6️⃣6️⃣ 🟩 B (Preparing urea from ammonium cyanate)
Explanation: Preparing urea from ammonium cyanate is an example of total synthesis, where a complex organic molecule is synthesized from simple inorganic materials.
6️⃣7️⃣ 🟪 C (Pyrrole is their example)
Explanation: Pyrrole is an aromatic compound containing nitrogen and is not alicyclic. Alicyclic compounds are non-aromatic compounds like cyclohexane and cyclopentane.
6️⃣8️⃣ 🟪 C (Hydroxylic and amino group)
Explanation: The hydroxylic group (–OH) contains oxygen, but the amino group (–NH₂) contains nitrogen, making this pair not exclusively oxygen-containing.
6️⃣9️⃣ 🟨 D (Physical properties)
Explanation: In a homologous series, while chemical behavior, general formula, and functional group are similar across the series, physical properties like boiling point and solubility vary due to the differences in molecular size and structure.
7️⃣0️⃣ 🟩 B (It burns exothermically)
Explanation: Methane is used as a fuel because it releases a large amount of energy (heat) when it burns, making it an efficient energy source. The combustion reaction is exothermic.
7️⃣1️⃣ 🟦 A (8 isomers)
Explanation: The pentyl group (C₅H₁₁–) has 8 isomers, which include both straight-chain and branched forms. There are 4 primary isomers, 3 secondary isomers, and 1 tertiary isomer.
7️⃣2️⃣ 🟦 A (4, 3, 1)
Explanation: The pentyl group (C₅H₁₁–) has 8 isomers:
4 primary isomers: n-pentyl, isopentyl, neopentyl, 3-methylbutyl
3 secondary isomers: sec-pentyl, 3-pentyl, 2-methylbutyl
1 tertiary isomer: tert-pentyl
7️⃣3️⃣ 🟦 A (Neo-butyl)
Explanation: The tert-butyl group is also known as the neo-butyl group. It is a type of branching where a tert-butyl group is attached to a carbon chain.
7️⃣4️⃣ 🟦 A (CₙH₂ₙ+₁CONH₂)
Explanation: The general formula for acid amides is CₙH₂ₙ+₁CONH₂. The structure includes a carbonyl group (C=O) bonded to an amino group (–NH₂), forming an amide functional group.
7️⃣5️⃣ 🟦 A (CₙH₂ₙ+₁SR)
Explanation: Thioethers are analogous to ethers but contain sulfur instead of oxygen. The general formula for thioethers is CₙH₂ₙ+₁…SR, where R represents an alkyl group, and S represents sulfur.
7️⃣6️⃣ 🟪 C (More than one ring)
Explanation: Polycyclic aromatic hydrocarbons (PAHs) contain multiple benzene rings fused together. These compounds have more than one ring, such as in naphthalene, anthracene, etc.
7️⃣7️⃣ 🟦 A (Primary groups)
Explanation: Iso-pentyl and iso-amyl pentyl groups are examples of primary groups because they are derived from straight-chain hydrocarbons with one branching point.
7️⃣8️⃣ 🟪 C (Both of them)
Explanation: Aromatic hydrocarbons like benzene follow the Hückel rule and the (4n+2π electrons) rule. These rules dictate that aromatic compounds must have a planar structure with a cyclic arrangement of 4n+2 delocalized π-electrons (where n is a non-negative integer).
7️⃣9️⃣ 🟩 B (C=NH)
Explanation: The imino group is characterized by a C=NH double bond, where nitrogen is bonded to a hydrogen atom. It is similar to a carbonyl group (C=O), but with nitrogen replacing oxygen.
8️⃣0️⃣ 🟩 B (C=O–NH₂)
Explanation: The acid amide group has a C=O–NH₂ structure, which consists of a carbonyl group (C=O) attached to an amino group (–NH₂). This functional group is found in amides, which are derivatives of carboxylic acids.
8️⃣1️⃣ 🟪 C.
Explanation: The nitrile group is characterized by a carbon–nitrogen triple bond, represented as –C≡N.
8️⃣2️⃣ 🟦 A.
Explanation: Biphenyl is an organic compound with two benzene rings connected by a single bond, with the molecular formula (C₆H₅)₂.
8️⃣3️⃣ 🟦 B.
Explanation: Diphenylmethane consists of a methane molecule with two phenyl groups attached. Its formula is (C₆H₅)₂CH₂.
8️⃣4️⃣ 🟨 D.
Explanation: Monocyclic aromatic hydrocarbons have only one benzene ring, like benzene itself. The term "monocyclic" refers to a single ring.
8️⃣5️⃣ 🟦 A.
Explanation: Ortho-xylene is 1,2-dimethylbenzene, one of the positional isomers of xylene.
8️⃣6️⃣ 🟩 B.
Explanation: Meta-xylene is 1,3-dimethylbenzene, another positional isomer of xylene.
8️⃣7️⃣ 🟪 C.
Explanation: Para-xylene is 1,4-dimethylbenzene, also a positional isomer of xylene.
8️⃣8️⃣ 🟪 C.
Explanation: Benzotrichloride (also known as α,α,α-trichlorotoluene) has the formula C₆H₅CCl₃.
8️⃣9️⃣ 🟦 A.
Explanation: Benzyl chloride (also known as chloromethylbenzene) has the formula C₆H₅CH₂Cl.
9️⃣0️⃣ 🟩 B.
Explanation: Benzal chloride has the formula C₆H₅CHCl₂.
9️⃣1️⃣ 🟩 B. Acylbenzene
Explanation: Acylbenzene refers to a compound with the formula C₆H₅CO– (benzene ring attached to a carbonyl group).
9️⃣2️⃣ 🟪 C. Alkynes
Explanation: –C≡C– represents a triple bond, which is the characteristic functional group of alkynes.
9️⃣3️⃣ 🟪 C. Three
Explanation: Methylcyclopropane has two secondary carbon atoms, one primary carbon atom, and one tertiary carbon atom.
9️⃣4️⃣ 🟨 D. All of them
Explanation: Pentane, isopentane, and neopentane are all open-chain aliphatic hydrocarbons.
9️⃣5️⃣ 🟦 A. Methane
Explanation: Methane is the simplest acyclic (open-chain) compound, meaning it is not cyclic.
9️⃣6️⃣🟩 B. 4
Explanation: In (CH₃)₂CHCH₂C₂H₅, there are four secondary hydrogen atoms attached to secondary carbons.
9️⃣7️⃣ 🟩 B. Paramagnetic
Explanation: Carbon free radicals are paramagnetic due to the presence of an unpaired electron.
9️⃣8️⃣ 🟪 C. Pyridine
Explanation: Pyridine is a heterocyclic compound because it contains a nitrogen atom in its ring structure.
9️⃣9️⃣ 🟨 C. A, B
Explanation: Ethylidene and Vinylidene are bivalent radicals, while Benzyl is univalent and Methylidyne is trivalent.
1️⃣0️⃣0️⃣ 🟪 C. C₆H₅–NH₂
Explanation: Aniline is aminobenzene with the formula C₆H₅–NH₂.
1️⃣0️⃣1️⃣ 🟨 D. Alkyne & alkadiene
Explanation: Both alkynes and alkadienes follow the general formula CₙH₂ₙ₋₂. Example: 1-Pentyne (C₅H₈) and 1,4-pentadiene (C₅H₈).
1️⃣0️⃣2️⃣ 🟨 D. CₙH₂ₙ₋₂
Explanation: Cycloalkenes have the same general formula as alkynes, CₙH₂ₙ₋₂, as they are ring-chain isomers.
1️⃣0️⃣3️⃣ 🟨 D. C₃H₆
Explanation: Cyclopropane is a cycloalkane with 3 carbon atoms and 6 hydrogen atoms, so its formula is C₃H₆.
1️⃣0️⃣4️⃣ 🟩 B. C₃H₄
Explanation: Cyclopropene is a cycloalkene with 3 carbon atoms and 4 hydrogen atoms, giving the formula C₃H₄.
1️⃣0️⃣5️⃣ 🟪 C. Ketone
Explanation: A ketone has two alkyl groups attached to the carbonyl group (C=O).
1️⃣0️⃣6️⃣ 🟨 D. both a and b
Explanation: Both aldehydes and ketones contain a carbonyl group (C=O).
1️⃣0️⃣7️⃣ 🟨 D. (NH₂)₂CO
Explanation: The chemical formula of urea is (NH₂)₂CO.
1️⃣0️⃣8️⃣ 🟪 C. Amides
Explanation: Urea belongs to the class of compounds called amides.
1️⃣0️⃣9️⃣ 🟨 D. No hydrogen atom
Explanation: The tertiary carbon in t-butyl alcohol is bonded to no hydrogen atoms, but instead to three other carbon atoms.
1️⃣1️⃣0️⃣ 🟪 C. Three carbon atoms
Explanation: The tertiary carbon in t-butyl alcohol is bonded to three carbon atoms (not hydrogen).
1️⃣1️⃣1️⃣ 🟩 B. 2,2,4-trimethylpentane
Explanation: The IUPAC name of iso-octane is 2,2,4-trimethylpentane.
1️⃣1️⃣2️⃣ 🟦 A. Heterocyclic
1️⃣1️⃣3️⃣ 🟪 C. R–O–R
Explanation: The ether functional group consists of a bivalent oxygen atom connected to two alkyl or aryl groups: R–O–R.
1️⃣1️⃣4️⃣ 🟩 B. Functional group
Explanation: A functional group is a group of atoms that imparts characteristic properties to a compound.
1️⃣1️⃣5️⃣ 🟩 B. Aromatic
Explanation: Aromatic hydrocarbons burn with a smoky flame due to their high carbon content.
1️⃣1️⃣6️⃣ 🟩 B. RCONH₂
Explanation: Amides have the functional group −CONH₂.
1️⃣1️⃣7️⃣ 🟦 A. Methylidene group
Explanation: Homologues of alkanes differ by the methylidene group (-CH₂-).
1️⃣1️⃣8️⃣ 🟪 C. Aniline
Explanation: Aniline is an aromatic compound, not heterocyclic.
1️⃣1️⃣9️⃣ 🟦 A. Aniline
Explanation: Aniline is an aromatic compound because it contains a benzene ring.
1️⃣2️⃣0️⃣ 🟨 D. (Correct structure of isobutyl alkyl radical)
Explanation: The isobutyl alkyl radical contains isopropyl groups at the end of the chain.
1️⃣2️⃣1️⃣ 🟪 C. CₙH₂ₙ₊₁
Explanation: When one hydrogen is removed from an alkane, the resulting product has the general formula CₙH₂ₙ₊₁, as one hydrogen atom is removed.
1️⃣2️⃣2️⃣ 🟩 B. Polyfunctional
Explanation: Organic compounds with more than one functional group are called polyfunctional compounds.
1️⃣2️⃣3️⃣ 🟪 C. ‒COOR
Explanation: The ester functional group is represented by ‒COOR, where R is an alkyl group.
1️⃣2️⃣4️⃣ 🟦 A. Ketone
Explanation: A ketone contains a carbonyl group bonded to two alkyl groups.
1️⃣2️⃣5️⃣ 🟨 D. Both A and B
Explanation: Both aldehydes and ketones contain the carbonyl group (C=O).
1️⃣2️⃣6️⃣ 🟪 C. (CH₃)₃CCH₂CH(CH₃)₂
Explanation: This compound contains primary, secondary, tertiary, and quaternary carbon atoms.
1️⃣2️⃣7️⃣ 🟦 A. Unsaturation
Explanation: The presence of a pi bond indicates unsaturation in the molecule. It shows that the molecule is not fully saturated with hydrogen.
1️⃣2️⃣8️⃣ 🟩 B. Anthracene
Explanation: Anthracene is a homocyclic aromatic hydrocarbon, not a heterocyclic compound.
1️⃣2️⃣9️⃣ 🟪 C. Furan
Explanation: Furan is a heterocyclic compound, containing an oxygen atom in the ring.
1️⃣3️⃣0️⃣ 🟪 C. C₆H₅-NH₂
Explanation: Aniline is aminobenzene with the formula C₆H₅5-NH₂.
1️⃣3️⃣1️⃣ 🟩 B. 6
Explanation: A primary carbon is a carbon atom bonded to only one other carbon. In the given compound, there are six terminal primary carbons (attached to one other carbon atom).
1️⃣3️⃣2️⃣ 🟨 D. 0
Explanation: Quaternary hydrogen is not possible because a quaternary carbon is bonded to four other carbon atoms and has no hydrogen attached.
1️⃣3️⃣3️⃣ 🟦 A. Correct structural formula of toluene
Explanation: Toluene is methylbenzene, with the structural formula C₆H₅CH₃.
Explanation: Cyclobutene is a four-membered ring compound with one double bond, and it has the formula C₄H₈.
1️⃣3️⃣5️⃣🟪 C. 2n
Explanation: The general formula for alkenes is CₙH₂ₙ, so an alkene with 'n' carbon atoms will have 2n hydrogen atoms.
1️⃣3️⃣6️⃣ 🟪 C. CₙH₂ₙ₋₆
Explanation: The general formula of monocyclic arenes (like benzene and toluene) is CₙH₂ₙ₋₆.
1️⃣3️⃣7️⃣ 🟨 D. Both A and B
Explanation: Both cycloalkanes and alkenes have the general formula CₙH₂ₙ.
1️⃣3️⃣8️⃣ 🟪 C. Waxy solids
Explanation: Alkanes containing 18 or more carbon atoms are typically waxy solids at room temperature.
1️⃣3️⃣9️⃣ 🟪 C. Water
Explanation: Alkanes are non-polar and thus not soluble in water, but they are soluble in non-polar solvents like benzene, carbon tetrachloride, and ether.
1️⃣4️⃣0️⃣ 🟨 D. Solubility
Explanation: The solubility of alkanes in water decreases as the molar mass increases, whereas boiling point, melting point, and density generally increase with increasing molar mass.
💥 غزل جونؔ ایلیا (کیوں سے) 💥
تاریخِ روزگارِ فنا لکھ رہا ہوں میں
دیباچئہ وجود پہ لا لکھ رہا ہوں میں
ہے یوں کہ مجھ سمیت نہیں کوئی بھی یہاں
جو بھی نہیں ہے اس کو خدا لکھ رہا ہوں میں
تجھ کو کہاں سموؤں میں اپنے حساب میں
ہے یوں کہ خود کوخود سے جدا لکھ رہا ہوں میں
زیرِ قلم کتابئہ بود و نبود ہے
اپنے ہر ایک قول میں یا لکھ رہا ہوں میں
کیا کہیے کس قدر ہوس انگیز ہے وہ شخص
خلوت میں رمزِ بندِ قبا لکھ رہا ہوں میں
اسلام کی میں ہجو کہوں میری کیا مجال
ہاں داستانِ کرب و بلا لکھ رہا ہوں میں
اے موسمِ بہار! عیادت کو میری آ
خاشاک کو متاعِ صبا لکھ رہا ہوں میں
اس کو بہت ہی اپنے تعین سے ہے گریز
عیار ہوں خدا کو خدا لکھ رہا ہوں میں
ہاں کاروبارِ بود چلا ہے نبود پر
ہاں صفحئہ فضا پہ خلا لکھ رہا ہوں میں
دانش کے مے کدوں میں یکی کی دوئی ہے عام
یکتا ہے تُو سو تجھ کو دوتا لکھ رہا ہوں میں
آخر کہاں گئی مرے آنگن کی چاندنی
مہتاب ! آج تجھ کو سُہا لکھ رہا ہوں میں
ہیں کون لوگ شہر میں آخر حرام خور؟
رُودادِ جرگئہ امرا لکھ رہا ہوں میں
مدت گزر گئی کہ نفس ہے فقط نفس
اک عمر سے ہوا کو ہوا لکھ رہا ہوں میں
حکمِ خدا تھا کیا وہ سلیمان کا پیام
بلقیس تجھ کو ننگِ سبا لکھ رہا ہوں میں
پہنائی سکوت میں گم ہے تمام تر
اور اس تمام تر میں صدا لکھ رہا ہوں میں
جس کا جواب ہی نہ ہو ایسا سوال کیا
کیا لکھ رہا ہوں، جانیے کیا لکھ رہا ہوں میں
عقدہ تھا ایک جہل کو در پیش دیر سے
دیر و حرم کو عقدہ کشا لکھ رہا ہوں میں
میں حالتی ہوں ایک عجب حال کا سوتُو
یہ بات مجھ کو بھی نہ بتا لکھ رہا ہوں میں
جانم بقا عذاب ہے یعنی اسی لیے
تیری فنا اور اپنی بقا لکھ رہا ہوں میں
یہ ظلم ہے علی پہ کہ اس کو خدا کہیں
پس ردِ گفتئہ جہلا لکھ رہا ہوں میں
اب تک تو میں بقا کی فنا میں فنا رہا
اس لمحے سے فنا کی بقا لکھ رہا ہوں میں
بارے میں حق کے اور حقیقت کے باب میں
رُودادِ لكنتِ فصحا لکھ رہا ہوں میں
تم نے بہ نامِ علم کیا کاروبارِ دیں
تم سب کے نام اے جہلا لکھ رہا ہوں میں
سرکارِ کبریا کی حقیقت تو کھل چکی
اب حیلہ سازئ سفرا لکھ رہا ہوں میں
فی الحال میری غیبتِ صغرا کا دور ہے
اسمائے رستئہ نقبا لکھ رہا ہوں میں
اب دیر و زود کا ہے عدم اور مرا وجود
اک حال بے صباح و مسالکھ رہا ہوں میں
Dive into today’s quiz part 2 on fundamentals of organic chemistry—perfect for MDCAT & ECAT aspirants. I hope you enjoy learning here as much as I enjoy teaching. 🌟
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🔥 Ace MDCAT & ECAT MCQs Quiz: Master the Fundamentals of Organic Chemistry Part 2 ! 🔬💡 | Essential Insights on Basics like Homologous Series, Functional Group and Isomerism
1️⃣ Compounds having same molecular formula but different structural formulae are said to be:
🟩 A. Polymers
🟪 B. Isomers
🟨 C. Monomers
🟥 D. Dimers
2️⃣ Which one of the following is a type of isomerism?
🟩 A. Chain or skeletal
🟪 B. Stereo isomerism
🟨 C. Metamerism
🟥 D. All of them
3️⃣ Two or more than two compounds of the same molecular formula having different carbon skeletons or chains are said to be:
🟩 A. Chain isomers
🟪 B. Functional isomers
🟨 C. Position isomers
🟥 D. Metamers
4️⃣ Two or more compounds of the same molecular formula having different structural formulas due to different position of the same functional group or multiple bonds (in case of unsaturated compounds) are termed as:
🟩 A. Chain isomers
🟪 B. Functional group isomers
🟨 C. Position isomers
🟥 D. Metamers
5️⃣ Decane has ________ isomers:
🟩 A. 3
🟪 B. 9
🟨 C. 25
🟥 D. 75
🟩 A. Positional isomerism
🟪 B. Functional isomerism
🟨 C. Chain isomerism
🟥 D. All of these
🟩 A. 2
🟪 B. 3
🟨 C. 4
🟥 D. None
8️⃣ Two or more compounds of the same molecular formula having different alkyl radicals attached to the same polyvalent atom are termed as:
🟩 A. Chain isomers
🟪 B. Position isomers
🟨 C. Functional isomers
🟥 D. Metamers
9️⃣ Two or more compounds of the same molecular formula having different functional groups are called:
🟩 A. Chain isomers
🟪 B. Position isomers
🟨 C. Functional isomers
🟥 D. Metamers
🔟 Propylene oxide is isomeric with:
🟩 A. Propanoic acid
🟪 B. Propanone
🟨 C. Propene
🟥 D. Propanol
🟩 A. 2
🟪 B. 3
🟨 C. 4
🟥 D. 5
🟩 A. 2
🟪 B. 3
🟨 C. 4
🟥 D. 8
1️⃣3️⃣.Which type of isomerism is being exhibited by FCH=CHF?
🟩 A. Position isomerism
🟪 B. Structural isomerism
🟨 C. Geometrical isomerism
🟥 D. Chain isomerism
🟩 A. 2
🟪 B. 3
🟨 C. 5
🟥 D. 4
1️⃣5️⃣.Which isomerism is NOT shown by alkene?
🟩 A. Chain isomerism
🟪 B. Position isomerism
🟨 C. Geometrical isomerism
🟥 D. Metamerism
1️⃣6️⃣.Ethanol and dimethyl ether are best considered as:
🟩 A. Stereo isomers
🟪 B. Enantiomers
🟨 C. Structural isomers
🟥 D. Diastereomers
1️⃣7️⃣.Which type of isomerism is shown by ether?
🟩 A. Metamerism
🟪 B. Functional isomerism
🟨 C. Positional isomerism
🟥 D. Both A and B
1️⃣8️⃣ Type of isomerism in BrCH=CHBr is:
🟩 A. Structural
🟪 B. Conformational
🟨 C. Geometrical
🟥 D. Positional
1️⃣9️⃣ 2-chlorobutane & 1-chlorobutane are:
🟩 A. Positional isomers
🟪 B. Chain isomers
🟨 C. Geometrical
🟥 D. None
🟩 A. 5
🟪 B. 8
🟨 C. 6
🟥 D. 4
🟩 A. 3
🟪 B. 2
🟨 C. 4
🟥 D. 5
🟩 A. 4
🟪 B. 5
🟨 C. 6
🟥 D. 7
🟩 A. 4
🟪 B. 3
🟨 C. 2
🟥 D. 7
2️⃣4️⃣.The phenomenon involving the migration of a proton to give two structural isomers in equilibrium with each other is known as:
🟩 A. Matamerism
🟪 B. Stereo isomerism
🟨 C. Cis-trans isomerism
🟥 D. Tautomerism
🟩 A. 4
🟪 B. 5
🟨 C. 6
🟥 D. 7
2️⃣6️⃣.Which one of the following is an isomer of dimethyl ether?
🟩 A. (CH₃)₂CHOH
🟪 B. CH₃CH₂OH
🟨 C. CHO-CHO
🟥 D. None
🟩 A. 7
🟪 B. 6
🟨 C. 4
🟥 D. 5
🟩 A. 9
🟪 B. 3
🟨 C. 4
🟥 D. 5
🟩 A. 4
🟪 B. 5
🟨 C. 6
🟥 D. 7
🟩 A. 7
🟪 B. 6
🟨 C. 4
🟥 D. 5
🟩 A. Metamerism
🟪 B. Functional isomerism
🟨 C. Position isomerism
🟥 D. All types
3️⃣2️⃣ Metamerism is not shown by:
🟩 A. Esters
🟪 B. Ketones
🟨 C. Ethers
🟥 D. Alcohols
3️⃣3️⃣ An isomer of C₂H₅OH is:
🟩 A. CH₃OH
🟪 B. (C₂H₅)₂O
🟨 C. (CH₃)₂O
🟥 D. CH₃COCH₃
3️⃣4️⃣ The isomerism shown by alkanes is:
🟩 A. Skeletal
🟪 B. Position
🟨 C. Geometric
🟥 D. Metamerism
3️⃣5️⃣ Metamerism is shown by:
🟩 A. Amines
🟪 B. Ethers
🟨 C. Both of them
🟥 D. None of them
3️⃣6️⃣ Acetic acid and methyl formate are called:
🟩 A. Cis-trans isomers
🟪 B. Functional isomers
🟨 C. Position isomers
🟥 D. Metamers
3️⃣7️⃣Which of the following pairs of homologous series is represented by the general molecular formula CₙH₂ₙ₋₂?
🟩 A. Alkyne & alkadiene
🟪 B. Alkyne and alkadiyne
🟨 C. Alkane & alkadiene
🟥 D. Alkene & alkyne
3️⃣8️⃣ Isomerism which is present only in alkene is:
🟩 A. Metamerism
🟪 B. Structural isomerism
🟨 C. Cis-trans isomerism
🟥 D. Both B and C
3️⃣9️⃣Which of the following is the structure of the isobutyl alkyl radical?
🟩 A.
🟪 B.
🟨 C.
🟥 D.
4️⃣0️⃣Select which one shows cis-trans isomerism:
🟩 A. Cl₂C=CCl₂
🟪 B. H₂C=CH₂
🟨 C. ClCH=CHCl
🟥 D. Br₂C=CBr₂
4️⃣1️⃣ Pentane and 2-methylbutane have the same:
🟩 A. Boiling point
🟪 B. Percentage composition
🟨 C. Structural formula
🟥 D. Melting point
4️⃣2️⃣Geometrical isomerism is usually found in:
🟩 A. Alkanes
🟪 B. Alkenes
🟨 C. Alkynes
🟥 D. Esters
4️⃣3️⃣Propene can exhibit:
🟩 A. Cis-trans isomerism
🟪 B. Geometrical isomerism
🟨 C. Both A and B
🟥 D. None of them
4️⃣4️⃣ Which of the following is an aromatic compound?
🟩 A. Aniline
🟪 B. Cyclobutane
🟨 C. Cyclohexanol
🟥 D. Neopentane
4️⃣5️⃣There are two types of isomerism: structural isomerism and stereoisomerism. The two main types of stereoisomerism are diastereomerism (including 'cis-trans isomerism' and optical isomerism). Each non-superimposable mirror image structure is called a/an:
🟩 A. Metamer
🟪 B. Elastomer
🟨 C. Enantiomer
🟥 D. Tautomer
4️⃣6️⃣ All of the following compounds can exist in the form of cis and trans isomers EXCEPT:
🟩 A. 2-butene
🟪 B. 1-bromo-2-chloropropene
🟨 C. 2-pentene
🟥 D. 1-pentene
4️⃣7️⃣ Ethoxyethane and methoxylpropane show which of the following types of isomerism?
🟩 A. Metamerism
🟪 B. Cis-trans isomerism
🟨 C. Position isomerism
🟥 D. Tautomerism
4️⃣8️⃣ Ethanol and dimethyl ether are best described as:
🟩 A. Structural isomers
🟪 B. Enantiomers
🟨 C. Stereoisomers
🟥 D. Diastereomers
4️⃣9️⃣ The number of chain isomers of butene are:
🟩 A. Three
🟪 B. Two
🟨 C. One
🟥 D. Zero
5️⃣0️⃣ The number of positional isomers of butene are:
🟩 A. Three
🟪 B. Two
🟨 C. One
🟥 D. Zero
5️⃣1️⃣ Metamerism is shown by:
🟩 A. Thioethers
🟪 B. Secondary amides
🟨 C. Secondary amines
🟥 D. All of them
🟩 A. Amines
🟪 B. Esters
🟨 C. Thioethers
🟥 D. Acid halides
5️⃣3️⃣ Geometric isomerism is present in:
🟩 A. Ethane
🟪 B. Propane
🟨 C. 2-Butene
🟥 D. Methane
5️⃣4️⃣ Which of the following is not an isomer of but-1-yne?
🟩 A. Methylcyclopropene
🟪 B. But-1,3-diene
🟨 C. But-2-ene
🟥 D. But-2-yne
5️⃣5️⃣ The isomer of an oxime is:
🟩 A. RNO
🟪 B. R–O–C≡N
🟨 C. R–O–N=O
🟥 D. RCONH₂
5️⃣6️⃣ What type of isomerism is NOT exhibited by different pairs of amines?
🟩 A. Functional isomerism
🟪 B. Position isomerism
🟨 C. Cis-trans isomerism
🟥 D. Metamerism
5️⃣7️⃣ An isomer of CH₃CH₂CHO is:
🟩 A. CH₃COCH₃
🟪 B. CH₃COOCH₃
🟨 C. CH₃OCH₃
🟥 D. CH₃NHCH₃
5️⃣8️⃣. Which of the following alkane(s) do not show isomerism?
🟩 A. Methane
🟪 B. Ethane
🟨 C. Propane
🟥 D. All of them
5️⃣9️⃣ Select one which shows cis-trans isomerism:
🟩 A. Cl₂C=CCl₂
🟪 B. CH₂=CH₂
🟨 C. BrCH=CHBr
🟥 D. Br₂C=CBr₂
6️⃣0️⃣ Which of the following compound may exist as cis-trans isomer?
🟩 A. 1-butene
🟪 B. 2-butene
🟨 C. Cyclopropane
🟥 D. Acetone
6️⃣1️⃣ Which type of isomerism is exhibited by Nitroethane?
🟦 A. Positional Isomerism
🟩 B. Tautomerism
🟪 C. Metamerism
🟨 D. None of them
🟦 A. 7
🟩 B. 5
🟪 C. 6
🟨 D. 9
6️⃣3️⃣ How many quaternary hydrogens are possible in alkane?
🟦 A. 1
🟩 B. 2
🟪 C. 3
🟨 D. 0
6️⃣4️⃣ Dimethyl ether and Ethyl alcohol are called:
🟦 A. Cis-Trans Isomers
🟩 B. Functional Group Isomers
🟪 C. Position Isomers
🟨 D. Metamers
6️⃣5️⃣ Which of the following alkanes contains all four types of carbon atoms (primary, secondary, tertiary & quaternary)?
🟦 A. (CH₃)₃CH
🟩 B. (CH₃)₃CHCH₂CH(CH₃)₂
🟪 C. (C₂H₅)₃CH
🟨 D. (CH₃)₄C
6️⃣6️⃣ If a compound has 'n' asymmetric carbon atoms with different terminal groups, the number of stereoisomers is given by the formula:
🟦 A. 2ⁿ🟩 B. (½)ⁿ
🟪 C. 2√n
🟨 D. √2ⁿ
🟦 A. 9
🟩 B. 7
🟪 C. 4
🟨 D. 11
6️⃣8️⃣ Number of primary carbon atoms in the given compound is:
🟦 A. 5
🟩 B. 6
🟪 C. 4
🟨 D. 2
6️⃣9️⃣ Metamerism is shown by:
🟦 A. Carboxylic Acid
🟩 B. Aldehydes
🟪 C. Neither A nor B
🟨 D. Both A and B
7️⃣0️⃣Acetone and Propionaldehyde are called:
🟦 A. Cis-Trans Isomers
🟩 B. Functional Group Isomers
🟪 C. Position Isomers
🟨 D. Metamers
7️⃣1️⃣ Acetic acid and methyl acetate are called:
🟦 A. Metamers
🟩 B. Functional Group Isomers
🟪 C. Position Isomers
🟨 D. Cis-Trans Isomers
7️⃣2️⃣ Which of the following compounds exhibit geometrical isomerism?
🟦 A. 2-methyl-2-butene
🟩 B. 2-pentene
🟪 C. 2-methyl-2-pentene
🟨 D. 1-pentene
7️⃣3️⃣ The type of stereoisomerism exhibited by enantiomers is called:
🟦 A. Optical Isomerism
🟩 B. Conformational Isomerism
🟪 C. Geometrical Isomerism
🟨 D. Chain Isomerism
7️⃣4️⃣ How many stereoisomers are possible for 2,3-dichlorobutane?
🟦 A. 2
🟩 B. 3
🟪 C. 4
🟨 D. 6
7️⃣5️⃣ How many chiral centers are present in 2,3-dichlorobutane?
🟦 A. 1
🟩 B. 2
🟪 C. 3
🟨 D. 4
7️⃣6️⃣ The number of possible geometrical isomers of 2-butene (C₄H₈) is:
🟦 A. 1
🟩 B. 2
🟪 C. 3
🟨 D. 4
7️⃣7️⃣ Which one of the following pairs are called position isomers?
🟦 A. CH₂(OH)CH₂COOH & CH₃CH(OH)COOH
🟩 B. CH₃CH₂CH₂OH & CH₃CH(OH)CH₃
🟪 C. (C₂H₅)₂CO & CH₃COCH₂CH₂CH₃
🟨 D. All the above
7️⃣8️⃣ The structures (CH₃)₃–CBr and CH₃(CH₂)₃Br present:
🟦 A. Chain Isomerism
🟩 B. Position Isomerism
🟪 C. Functional Isomerism
🟨 D. Both (A) and (B)
7️⃣9️⃣ In keto-enol tautomerism of dicarbonyl compounds, the enol form is preferred in contrast to the keto-form, this is due to:
🟦 A. Presence of Methylene Group
🟩 B. Presence of Carbonyl Group on Each Side of –CH₂–
🟪 C. Resonance Stabilization of Enol Form
🟨 D. Rapid Chemical Exchange
8️⃣0️⃣ Which of the following are isomers?
🟦 A. Ethanol and Ethoxy Ethane
🟩 B. Methanol and Methoxy Methane
🟪 C. Propanoic Acid and Ethyl Acetate
🟨 D. Acetic Acid and Methyl Formate
8️⃣1️⃣ Which alkene could exist in cis and trans forms?
🟦 A.
🟩 B.
🟪 C.
🟨 D.
🟦 A. Only an Acid
🟩 B. Only an Ether
🟪 C. Only an Alcohol
🟨 D. Both Ether and Alcohol
8️⃣3️⃣ Which one of the following pairs are called position isomers?
🟦 A. CH₃CH₂(OH)CH₂COOH & CH₃-CH(OH)COOH
🟩 B. C₂H₅OH & CH₃OH
🟪 C. (C₂H₅)₂CO & CH₃COCH₂CH₃
🟨 D. None of them
8️⃣4️⃣ Alkene show geometrical isomers due to:
🟦 A. Asymmetry
🟩 B. Rotation around a single bond
🟪 C. Resonance
🟨 D. Restricted rotation around a double bond
8️⃣5️⃣ The formula C₃H₆O₂ represents –
🟦 A. Only an Acid
🟩 B. Both an Acid and an Ester
🟪 C. Only an Alcohol
🟨 D. Both Ether and Alcohol
8️⃣6️⃣ Which of the following are isomers?
🟦 A. Ethanol and Ethoxy Ethane
🟩 B. Methanol and Methoxy Methane
🟪 C. Propanoic Acid and Ethyl Acetate
🟨 D. Propionaldehyde and Acetone
8️⃣7️⃣ An organic compound having molecular C₂H₆O can exhibit functional group isomerism. Select the correct isomers:
🟦 A. Methanol and Methoxy Methane
🟩 B. Ethanol and Methoxy Methane
🟪 C. Ethanol and Ethoxy Ethane
🟨 D. Methanol and Ethoxy Ethane
8️⃣8️⃣ Which of the following pairs are structural isomers?
🟩 B. C₂H₆ — Ethane and Ethene
🟪 C. C₃H₆ — Propene and Cyclopropane
🟨 D. Both A and C
8️⃣9️⃣ Which of the following is an example of positional isomerism?
🟦 A. 1-Butanol and 2-Butanol
🟩 B. Butane and Isobutane
🟪 C. Propene and Cyclopropane
🟨 D. None of these
9️⃣0️⃣ Structural isomerism is given by:
🟦 A. Hydrocarbons only
🟩 B. Hydrocarbons and their Derivatives
🟪 C. Derivatives of Hydrocarbons
🟨 D. Only Carbohydrates
9️⃣1️⃣ Which of the following is the important natural sources of organic compounds?
🟦 A. Plants and Coals
🟩 B. Petroleum
🟪 C. Natural Gas
🟨 D. All of them
9️⃣2️⃣ Which of the following is the decaying product of plants?
🟦 A. Coals
🟩 B. Petroleum
🟪 C. Natural Gas
🟨 D. All of them
9️⃣3️⃣ Which of the following is the main component of coal?
🟦 A. Pb
🟩 B. P
🟪 C. C
🟨 D. Na
9️⃣4️⃣ Which one of the following is NOT a component of coal?
🟦 A. N
🟩 B. O or S
🟪 C. H
🟨 D. Si
9️⃣5️⃣ The hardest and the driest form of coal containing 92-98% C and burns without smoke is called:
🟦 A. Anthracite
🟩 B. Sub-bituminous Coal
🟪 C. Bituminous Coal
🟨 D. Lignite
9️⃣6️⃣ Which one of the following is the product of carbonization or destructive distillation of coal?
🟦 A. Coal Tar
🟩 B. Coke (100% Purest C)
🟪 C. Coke-Oven Gas/Coal Gas
🟨 D. All of them
9️⃣7️⃣ Which of the following is a type of coal?
🟦 A. Anthracite
🟩 B. Bituminous Coal
🟪 C. Lignite (Peat)
🟨 D. All of them
9️⃣8️⃣ The first stage in the conversion of vegetable matter into coal is:
🟦 A. Peat
🟩 B. Anthracite Coal
🟪 C. Bituminous Coal
🟨 D. Lignite
9️⃣9️⃣ Which one of the following forms of coal contains 80% C and is used at power generating stations?
🟦 A. Anthracite
🟩 B. Sub-bituminous Coal
🟪 C. Bituminous Coal
🟨 D. Lignite
1️⃣0️⃣0️⃣ The most abundant form of coal and is used as an energy source and carbonization for coke, coal tar, and coke-oven gas is called:
🟦 A. Anthracite
🟩 B. Sub-bituminous Coal
🟪 C. Bituminous Coal
🟨 D. Lignite
💡 ✨ Answers with Explanations ✨
1️⃣ Answer: B. Isomers
Compounds with the same molecular formula but different structural arrangements are called isomers.
2️⃣ Answer: D. All of them
Chain, stereo, and metamerism are all types of isomerism.
3️⃣ Answer: A. Chain isomers
Isomers with different carbon skeletons or chains are known as chain isomers.
4️⃣ Answer: C. Position isomers
Isomers that differ in the position of a functional group or multiple bonds are position isomers.
5️⃣ Answer: C. 25
6️⃣ Answer: D. All of these
7️⃣ Answer: B. 3
8️⃣ Answer: D. Metamers
Metamers are isomers that differ in the alkyl groups attached to the same functional group.
9️⃣ Answer: C. Functional isomers
Isomers that have different functional groups but the same molecular formula are functional isomers.
🔟 Answer: C. Propene
Propylene oxide (C₃H₆O) is isomeric with propene (C₃H₆), as they both have the same molecular formula but different structural arrangements.
1️⃣1️⃣ Answer: C. 4
C₄H₉OH is butyl alcohol, which has four isomeric forms: primary butyl alcohol, secondary butyl alcohol, isobutyl alcohol, and tertiary butyl alcohol.
1️⃣2️⃣ Answer: D. 8
1️⃣3️⃣ Answer: C. Geometrical isomerism
FCH=CHF shows double bonds, and each carbon is attached to two different groups, which allows for cis-trans or geometrical isomerism.
1️⃣4️⃣Answer: D. 4
1️⃣5️⃣ Answer: D. Metamerism
Alkenes can show chain isomerism, position isomerism, and geometrical isomerism, but not metamerism, as it requires a functional group like R−O−R′, which alkenes do not have.
1️⃣6️⃣ Answer: C. Structural isomers
Ethanol (CH₃CH₂ OH) and dimethyl ether (CH₃OCH₃) are structural isomers (constitutional isomers), as they have the same molecular formula but different structural arrangements.
1️⃣7️⃣ Answer: D. Both A and B
Ethers can exhibit both metamerism (due to different alkyl groups on the same oxygen atom) and functional isomerism (due to the functional group being different in position or bonding).
1️⃣8️⃣ Answer: C. Geometrical
BrCH=CHBr has a double bond with different substituents attached to the carbon atoms, allowing it to show geometrical isomerism (cis-trans).
1️⃣9️⃣ Answer: A. Positional isomers
2-chlorobutane and 1-chlorobutane are positional isomers because the chlorine atom is attached to different carbon atoms in each compound.
2️⃣0️⃣ Answer: B. 8
C₅H₁₂ can form 8 different alkyl groups, based on the possible branching patterns of the carbon chain.
2️⃣1️⃣ Answer: A. 3
2️⃣2️⃣ Answer: D. 7
C₅H₁₀O follows the general formula CₙH₂ₙO, and the possible isomers (4 aldehydes and 3 ketones) total 7 aliphatic carbonyl compounds.
2️⃣3️⃣ Answer: B. 3
2️⃣4️⃣ Answer: D. Tautomerism
Tautomerism involves the migration of a proton to give two structural isomers that are in equilibrium, such as keto-enol tautomerism.
2️⃣5️⃣ Answer: D. 7
C₄H₆ can have 7 structural isomers, including various cyclic and acyclic forms.
2️⃣6️⃣ Answer: B. CH₃CH₂OH
Dimethyl ether (CH₃OCH₃) is isomeric with ethanol (CH₃CH₂OH), as they are both ethers and alcohols, respectively.
2️⃣7️⃣ Answer: D. 5
For C₄H₆ (butyne), the cyclic isomers include cyclobutane, methylcyclopropane, and others, totaling 5 cyclic isomers.
2️⃣8️⃣ Answer: C. 4
2️⃣9️⃣ Answer: B. 5
C₆H₁₄ (hexane) has 5 structural isomers: n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane.
3️⃣0️⃣Answer: A. 7
C₅H₁₀ can form 7 cyclic isomers, including cyclopentane, methylcyclobutane, and other ring-structured compounds.
3️⃣1️⃣Answer: D. All types
C₄H₁₀O can show metamerism (due to ethers), functional isomerism (because it can be alcohol or ether), and position isomerism (depending on the position of the functional group).
3️⃣2️⃣ Answer: C. Ethers
Ethers do not show metamerism because they do not have a polyvalent functional group like esters or ketones. Ethers only exhibit functional isomerism and sometimes position isomerism.
3️⃣3️⃣ Answer: C. (CH₃)₂O
Dimethyl ether (CH₃OCH₃) is an isomer of ethanol (C₂H₅OH) since both have the same molecular formula but different structural formulas.
3️⃣4️⃣ Answer: A. Skeletal
Alkanes only show skeletal (chain) isomerism, where the carbon chain is arranged differently, but the functional group is the same.
3️⃣5️⃣ Answer: C. Both of them
Both ethers and secondary amines can show metamerism, as they can have different alkyl groups attached to the same functional group.
3️⃣6️⃣ Answer: B. Functional isomers
Acetic acid (CH₃COOH) and methyl formate (CH₃OCOH) are functional isomers because they have different functional groups (carboxyl and ester, respectively).
3️⃣7️⃣ Answer: D. Alkene & alkyne
Alkynes and alkenes both follow the molecular formula CₙH₂ₙ₋₂. Example: C₅H₈ for both alkynes (e.g., 1-pentyne) and alkenes (e.g., 1,4-pentadiene).
3️⃣8️⃣ Answer: C. Cis-trans isomerism
Cis-trans isomerism (geometrical isomerism) only occurs in alkenes, where the groups attached to the double-bonded carbons can be arranged differently (cis or trans).
3️⃣9️⃣ Answer: D.
The isobutyl alkyl radical (C₄H₉) contains an isopropyl group at the end of the chain. Option D represents the correct structure.
4️⃣0️⃣ Answer: C. ClCH=CHCl
ClCH=CHCl shows cis-trans isomerism because both carbons involved in the double bond are attached to different substituents (Cl and H), allowing for cis-trans (geometrical) isomerism.
4️⃣1️⃣ Answer: B. Percentage composition
Pentane (C₅H₁₂) and 2-methylbutane (C₅H₁₂) have the same molecular formula, so they have the same percentage composition (same ratio of elements), although they differ in structure.
4️⃣2️⃣ Answer: B. Alkenes
Geometrical isomerism (cis-trans) occurs in alkenes because the double bond restricts rotation, and different groups can be attached to each carbon of the double bond.
4️⃣3️⃣ Answer: D. None of them
Propene (C₃H₆) cannot exhibit cis-trans isomerism because it only has one methyl group attached to one of the carbons in the double bond, making it impossible to form isomers.
4️⃣4️⃣ Answer: A. Aniline
Aniline (C₆H₅NH₂) is an aromatic compound because it contains a benzene ring. Cyclobutane and cyclohexanol are non-aromatic, and neopentane is aliphatic.
4️⃣5️⃣ Answer: C. Enantiomer
Enantiomers are non-superimposable mirror images of each other, which is the definition of optical isomerism. They occur when a molecule has a chiral center (as in most amino acids, except glycine).
4️⃣6️⃣ Answer: D. 1-pentene
1-Pentene (C₅H₁₀) does not show cis-trans isomerism because the double bond is at the end of the chain (terminal), so no different groups can be attached to both carbons of the double bond.
4️⃣7️⃣ Answer: A. Metamerism
Ethoxyethane (CH₃CH₂OCH₂CH₃) and methoxylpropane (CH₃OCH₂CH₂CH₃) are metamers because they have different alkyl groups attached to the same oxygen atom, a key characteristic of metamerism.
4️⃣8️⃣ Answer: A. Structural isomers
Ethanol (C₂H₅OH) and dimethyl ether (CH₃OCH₃) are structural isomers because they have the same molecular formula but different connectivity of atoms.
4️⃣9️⃣Answer: B. Two
5️⃣0️⃣ Answer: B. Two
Butene (C₄H₈) has two positional isomers: but-1-ene and but-2-ene, which differ in the position of the double bond.
5️⃣1️⃣ Answer: D. All of them
Metamerism occurs in compounds with polyvalent functional groups such as ethers, secondary amides, secondary amines, thioethers, etc. These groups can show isomerism based on the alkyl groups attached to the functional group.
5️⃣2️⃣ Answer: D. Acid halides
Acid halides have a monovalent terminal functional group (-COX), which cannot show metamerism as it does not have multiple alkyl groups attached to the same atom or group.
5️⃣3️⃣ Answer: C. 2-Butene
Geometric (cis-trans) isomerism is possible in alkenes like 2-butene, where different groups can be attached to the carbons in the double bond.
5️⃣4️⃣ Answer: C. But-2-ene
But-2-ene is an alkene, and alkynes like but-1-yne and but-2-yne do not exhibit isomerism with alkenes. Methylcyclopropene and but-1,3-diene are functional and positional isomers of but-1-yne.
5️⃣5️⃣ Answer: A. RNO
An oxime has the general formula R₂C=NOH and exhibits tautomerism. The correct isomer of an oxime would be a structure like RNO, where the nitrogen is doubly bonded to carbon.
5️⃣6️⃣ Answer: C. Cis-trans isomerism
Amines cannot exhibit cis-trans isomerism because they lack the necessary structure—namely, a rigid double bond or cyclic structure that would restrict rotation and allow for different spatial arrangements.
5️⃣7️⃣ Answer: A. CH₃COCH₃
CH₃COCH₃ (acetone) is a functional isomer of CH₃CH₂CHO (ethanal). Both are carbonyl compounds, but one is an aldehyde (ethanal) and the other is a ketone (acetone).
5️⃣8️⃣ Answer: D. All of them
Methane, ethane, and propane do not show isomerism. Isomerism begins with four-carbon alkanes (butane) and above, where chain and positional isomerism can occur.
5️⃣9️⃣ Answer: C. BrCH=CHBr
BrCH=CHBr shows cis-trans isomerism because the double bond in the molecule has two different groups attached to each carbon, fulfilling the conditions for geometrical isomerism.
6️⃣0️⃣ Answer: B. 2-butene
2-butene can exhibit cis-trans isomerism, where the methyl groups can either be on the same side (cis) or opposite sides (trans) of the double bond. 1-butene cannot because it is a terminal alkene.
6️⃣1️⃣ Answer: 🟩 B. Tautomerism
Explanation: Nitroethane exhibits aci-nitro tautomerism where the α−H atom is labile, forming nitrolic acid.
6️⃣2️⃣ Answer: 🟨 D. 9
Explanation: Nine isomers of C₇H₁₆ (Heptane) exist, including straight chain, branched, and methylated forms.
6️⃣3️⃣ Answer: 🟨 D. 0
Explanation: Quaternary carbon atoms are not possible in simple alkanes with fewer than five carbon atoms.
6️⃣4️⃣ Answer: 🟩 B. Functional Group Isomers
Explanation: Dimethyl ether and ethyl alcohol are functional group isomers because they have different functional groups (ether vs alcohol).
6️⃣5️⃣ Answer: 🟩 B.
Explanation: The compound (CH₃)₃CHCH₂CH(CH₃)₂ contains primary, secondary, tertiary, and quaternary carbon atoms.
6️⃣6️⃣ Answer: 🟦 A. 2ⁿ
Explanation: The number of stereoisomers is given by 2ⁿ, where 'n' is the number of asymmetric carbon atoms.
6️⃣7️⃣ Answer: 🟨 D. 11
Explanation: The C₄H₆ formula has 11 isomers, combining dienes, alkynes, and cyclic structures.
6️⃣8️⃣ Answer: 🟩 B. 6
Explanation: The given compound has six primary carbon atoms, each at the ends of carbon chains.
6️⃣9️⃣ Answer: 🟨 C. Neither A nor B
Explanation: Metamerism is not shown by carboxylic acids or aldehydes because they have monovalent terminal functional groups.
7️⃣0️⃣ Answer: 🟩 B. Functional Group Isomers
Explanation: Acetone (ketone) and propionaldehyde (aldehyde) are functional group isomers because they contain different functional groups.
7️⃣1️⃣ Answer: 🟩 B. Functional Group Isomers
Explanation: Acetic acid and methyl acetate are functional group isomers because they contain different functional groups (carboxyl vs ester).
7️⃣2️⃣ Answer: 🟩 B. 2-pentene
Explanation: 2-pentene exhibits geometrical isomerism due to the possibility of cis and trans forms.
7️⃣3️⃣ Answer: 🟦 A. Optical Isomerism
Explanation: Enantiomers are optical isomers because they are non-superimposable mirror images and rotate plane-polarized light in opposite directions.
7️⃣4️⃣ Answer: 🟪 C. 4
Explanation: 2,3-Dichlorobutane has 2 chiral centers, giving 4 stereoisomers (including one meso form).
7️⃣5️⃣ Answer: 🟩 B. 2
Explanation: 2,3-Dichlorobutane has 2 chiral centers (C2 and C3), giving 2 chiral centers in total.
7️⃣6️⃣ Answer: 🟩 B. 2
Explanation: 2-butene has two possible geometrical isomers: cis-2-butene and trans-2-butene.
7️⃣7️⃣ Answer: 🟪 C. (C₂H₅)₂CO & CH₃COCH₂CH₂CH₃
Explanation: These are position isomers because the position of the functional group (carbonyl) is different in each molecule.
7️⃣8️⃣ Answer: 🟦 A. Chain Isomerism
Explanation: (CH₃)₃–CBr and CH₃(CH₂)₃Br exhibit chain isomerism, where the carbon chain differs in structure.
7️⃣9️⃣ Answer: 🟪 C. Resonance Stabilization of Enol Form
Explanation: The enol form is stabilized through resonance, making it more preferred compared to the keto form.
8️⃣0️⃣ Answer: 🟨 D. Acetic Acid and Methyl Formate
Explanation: Acetic acid and methyl formate are functional isomers because they have different functional groups (carboxyl vs ester).
8️⃣1️⃣ Answer: 🟩 B.
Explanation: For geometrical isomerism, the terminal carbons must have different groups. Option B satisfies this condition, while the others do not.
8️⃣2️⃣ Answer: 🟦 A. Only an Acid
Explanation: The molecular formula C₄H₈O₂ corresponds to an acid or ester, specifically an acid in this case.
8️⃣3️⃣ Answer: 🟨 D. None of them
Explanation: The pairs listed are homologues, not position isomers, as they differ by one or more elements but not by functional group position.
8️⃣4️⃣ Answer: 🟨 D. Restricted rotation around a double bond
Explanation: Alkenes exhibit geometrical isomerism due to the restricted rotation around the double bond, preventing cis-trans interconversion.
8️⃣5️⃣ Answer: 🟩 B. Both an Acid and an Ester
Explanation: C₃H6O₂ can represent both an acid (like acetic acid) and an ester (like methyl acetate).
8️⃣6️⃣ Answer: 🟨 D. Propionaldehyde and Acetone
Explanation: Propionaldehyde (RCHO) and acetone (CH₃COCH₃) are functional group isomers, as they contain different functional groups (aldehyde vs ketone).
8️⃣7️⃣ Answer: 🟩 B. Ethanol and Methoxy Methane
Explanation: The molecular formula C₂H6O can represent both an alcohol (ethanol) and an ether (methoxy methane), showing functional group isomerism.
8️⃣8️⃣ Answer: 🟨 D. Both A and C
Explanation: Both Butane (CH₃-CH₂-CH₂-CH₃) and 2-Methylpropane ((CH₃)₃CH), and Propene (CH₃-CH=CH₂) and Cyclopropane (C₃H₆) are structural isomers with different bonding arrangements.
8️⃣9️⃣ Answer: 🟦 A. 1-Butanol and 2-Butanol
Explanation: Position isomerism occurs when the functional group is attached to different positions on the same carbon chain.
9️⃣0️⃣ Answer: 🟩 B. Hydrocarbons and their Derivatives
Explanation: Structural isomerism occurs in hydrocarbons and their derivatives, which can differ by the arrangement of atoms in the molecule.
9️⃣1️⃣ Answer: 🟨 D. All of them
Explanation: The natural sources of organic compounds include plants, animals, coal, petroleum, and natural gas.
9️⃣2️⃣ Answer: 🟨 D. All of them
Explanation: Coals, petroleum, and natural gas are all decaying products of plant matter over millions of years.
9️⃣3️⃣ Answer: 🟪 C. C
Explanation: The main component of coal is carbon (C), which is present in varying amounts depending on the type of coal.
9️⃣4️⃣ Answer: 🟨 D. Si
Explanation: Si (Silicon) is not a typical component of organic compounds or coal. Coal mainly contains carbon, hydrogen, oxygen, nitrogen, and sulfur.
9️⃣5️⃣ Answer: 🟦 A. Anthracite
Explanation: Anthracite is the hardest and driest form of coal, with a carbon content of 92-98%, and it burns without smoke.
9️⃣6️⃣ Answer: 🟨 D. All of them
Explanation: Destructive distillation (carbonization) of bituminous coal produces coke, coal gas, coal tar, and ammonia liquor.
9️⃣7️⃣ Answer: 🟨 D. All of them
Explanation: There are five stages of coal, with different types, including Anthracite, Bituminous coal, and Lignite (Peat).
9️⃣8️⃣ Answer: 🟦 A. Peat
Explanation: Peat is the first stage in the conversion of vegetable matter into coal, consisting mainly of partially decomposed plant material.
9️⃣9️⃣ Answer: 🟩 B. Sub-bituminous Coal
Explanation: Sub-bituminous coal contains about 80% carbon and is used at power generation stations.
1️⃣0️⃣0️⃣ Answer: 🟪 C. Bituminous Coal
Explanation: Bituminous coal is the most abundant form of coal and is used as an energy source, as well as for the production of coke, coal tar, and coke-oven gas.
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