๐ Welcome to Inamjazbi Learn Chemistry! ๐
๐ Whether you're preparing for MDCAT, ECAT, or FSC, this MCQ Quiz is YOUR key to success! ๐งช๐ก
✅ Perfect for exam preparation – designed to help you master the toughest topics in chemistry ๐
✅ Boost your scores with smart tips and tricks ๐ฅ
✅ Learn unique solving strategies and quick hacks ๐ฏ
๐ฅ This isn’t just another quiz – it’s a game‑changer!
๐ MDCAT/ECAT/FSC/XII Grand Chemistry MCQs Interactive Quiz #3 ๐งช๐ก | Learn & Practice!
1. Which of the following composition justifies the secondary alkyl halide?
a) R₃CX
b) R₂CHX
c) RCH₂X
d) CH₃X
✅ Correct Answer: (b)
R₂CHX → Secondary halide has halogen attached to carbon bonded with 2 other carbons.
R₂CHX → Secondary halide has halogen attached to carbon bonded with 2 other carbons.
2. Which of the following alkyl halide cannot produce an alkene while treated with alcoholic potassium hydroxide?
a) CH₃Br
b) C₂H₅Br
c) C₃H₇Br
d) C₄H₉Br
✅ Correct Answer: (a)
CH₃Br → No ฮฒ-hydrogen, so elimination (alkene formation) is impossible.
CH₃Br → No ฮฒ-hydrogen, so elimination (alkene formation) is impossible.
3. C₂H₅MgBr with CO₂ yields:
a) HCOOH
b) CH₃COOH
c) C₂H₅COOH
d) C₃H₇COOH
✅ Correct Answer: (c)
C₂H₅COOH (Propanoic acid) → Grignard reagent + CO₂ → carboxylic acid with one extra carbon.
C₂H₅COOH (Propanoic acid) → Grignard reagent + CO₂ → carboxylic acid with one extra carbon.
4. Grignard’s reagent with ester produces:
a) Aldehyde
b) Carboxylic acid
c) Ketone
d) Ether
✅ Correct Answer: (c)
Ketone → Ester reacts with 2 moles of Grignard reagent → tertiary alcohol via ketone intermediate. ๐ In practice, the reaction continues to give a tertiary alcohol after hydrolysis, but in MCQs the expected answer is Ketone.
Ketone → Ester reacts with 2 moles of Grignard reagent → tertiary alcohol via ketone intermediate. ๐ In practice, the reaction continues to give a tertiary alcohol after hydrolysis, but in MCQs the expected answer is Ketone.
5. Amine act as bases because:
a) They accept OH⁻
b) They donate OH⁻
c) They donate H⁺
d) They accept H⁺
✅ Correct Answer: (d)
They accept H⁺ → ๐ Lone pair on nitrogen makes amines Lewis bases.
They accept H⁺ → ๐ Lone pair on nitrogen makes amines Lewis bases.
6. The structure of primary amine is:
a) Planar trigonal
b) Regular tetrahedral
c) Tetrahedral pyramidal
d) Linear
✅ Correct Answer: (c)
Tetrahedral pyramidal ๐ Due to sp³ hybridization and lone pair on nitrogen.
Tetrahedral pyramidal ๐ Due to sp³ hybridization and lone pair on nitrogen.
7. Alkyl amine when reacts with nitrous acid (HNO₂) in the presence of HCl yields:
a) Diazonium salt
b) Aldehyde
c) Ketone
d) Alcohol
✅ Correct Answer: (d)
Alcohol ๐ Primary aliphatic amine + nitrous acid → alcohol via diazotization.
Alcohol ๐ Primary aliphatic amine + nitrous acid → alcohol via diazotization.
Your Score: 0 / 0