Unit # 23… MCQs on Chemistry of Alcohols
1. The general formula of alcohol is:
(a)
|
CnH2n+1…OH
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(b)
|
CnH2n+2O
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(c)
|
CnH2nO
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(d)
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Both (a) and (b)
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2. Which of the following is a dihydric
alcohol?
(a)
|
Ethanol
|
(b)
|
isobutyl alcohol
|
(c)
|
Ethylene glycol
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(d)
|
Glycerol
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3. Which of the following is a trihydric
alcohol?
(a)
|
Ethanol
|
(b)
|
isobutyl alcohol
|
(c)
|
Ethylene glycol
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(d)
|
Glycerol
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4. Which type of isomerism is shown by
alcohols?
(a)
|
Chain isomerism
|
(b)
|
Position isomerism
|
(c)
|
Functional group isomerism
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(d)
|
All of the above
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5. Which is an isomer of ethanol?
(a)
|
CH3OH
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(b)
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CH3OC2H5
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(c)
|
CH3OCH3
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(d)
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C2H5OC2H5
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6. Of
the following four characteristic groups, which is the characteristic group of
secondary alcohol?
(a)
|
– CH2OH
|
(b)
|
>CHOH
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(c)
|
 >COH |
(d)
|
–COOH
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7. The functional group of alcohol is:
(a)
|
–O–
|
(b)
|
–CO–
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(c)
|
–OH
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(d)
|
–X
|
8. Which one of the following is called wood
spirit or wood naphtha?
(a)
|
Ethyl alcohol
|
(b)
|
Ethene
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(c)
|
Methyl alcohol
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(d)
|
Propyl alcohol
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9. The strongly acidic tarry liquids obtained
from the destructive distillation of wood is called:
(a) Lactic acid
(b)Pyroligenous acid
(c) Pyruvic acid
(d) Carboxylic acid
10. Which of the following is not present in
pyroligenous acid?
(a)
|
Methane
|
(b)
|
Methanol
|
(c)
|
Acetone or Acetic acid
|
(d)
|
Methyl acetate
|
11. Catalytic
reduction (hydrogenation) of carbon monooxide with H2 under high
pressure and temperature gives
methyl alcohol. This process is called:
(a)
|
Baeyer’s test
|
(b)
|
Hofmann’s reaction
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(c)
|
Kolb process
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(d)
|
Petret process
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12. Alcoholic fermentation is brought out by
the action of:
(a)
|
CO2
|
(b)
|
Yeast
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(c)
|
Acetone
|
(d)
|
CO
|
13. Which one is prepared on large scale by
the fermentation of starch or molasses?
(a)
|
Methanol
|
(b)
|
Ethanol
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(c)
|
Acetone
|
(d)
|
Ethanal
|
14. Ethyl
alcohol obtained by fermentation of starch or molasses is called wash which is
_____% pure.
(a)
|
15%
|
(b)
|
95%
|
(c)
|
99.9%
|
(d)
|
85%
|
15. 15% pure ethyl alcohol (wash) on
fractional distillation gives 95% ethyl alcohol by weight which is commonly called:
(a)
|
Wash
|
(b)
|
Absolute alcohol
|
(c)
|
Rectified spirit
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(d)
|
Methylated spirit
|
16. Rectified spirit treated quick lime (CaO)
on fractional distillation gives:
(a)
|
Wash
|
(b)
|
Absolute alcohol
|
(c)
|
Rectified spirit
|
(d)
|
Methylated spirit
|
17. Ethanol is rendered unfit for drinking by addition
of poisonous substances such as methanol.
The process is called:
(a)
|
Fermentation
|
(b)
|
Denaturing
|
(c)
|
Retardation
|
(d)
|
Catalysis
|
18. The denatured alcohol rendered unfit for
drinking is called:
(a)
|
Wash
|
(b)
|
Absolute alcohol
|
(c)
|
Rectified spirit
|
(d)
|
Methylated spirit
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19. Methylated sprit contains 85% ethanol and
______ methanol:
(a)
|
4%
|
(b)
|
20%
|
(c)
|
15%
|
(d)
|
22%
|
20. Which
one of the following compound is obtained by the oxidation of primary alcohol
with nascent oxygen?
(a)
|
Alkanal
|
(b)
|
Alkanone
|
(c)
|
Ether
|
(d)
|
Amine
|
21. Which
one of the following compound is obtained by the oxidation of secondary
alcohols by [O]?
(a)
|
Ketone
|
(b)
|
Aldehyde
|
(c)
|
Ether
|
(d)
|
Amine
|
22. Primary alcohols on catalytic dehydrogenation
by Cu-Ni couple gives:
(a)
|
Ketone
|
(b)
|
Aldehyde
|
(c)
|
Carboxylic acid
|
(d)
|
Alkene
|
23. Secondary alcohols on catalytic
dehydrogenation by Cu-Ni couple gives:
(a)
|
Ketone
|
(b)
|
Aldehyde
|
(c)
|
Carboxylic acid
|
(d)
|
Alkene
|
24. The dehydration of alcohols gives:
(a)
|
Ketone
|
(b)
|
Aldehyde
|
(c)
|
Alkane
|
(d)
|
Alkene
|
25. The reaction of carboxylic acids with
alcohols catalysed by conc. H2SO4 is called:
(a)
|
Dehydration
|
(b)
|
Saponification
|
(c)
|
Esterification
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(d)
|
Neutralization
|
26. Which test is used to distinguish three
types of alcohols?
(a)
|
Lucas test
|
(b)
|
Layer test
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(c)
|
Silver mirror test
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(d)
|
Baeyer’s test
|
27. Which one is a constituent of sprits,
wine, and beer?
(a)
|
Methanol
|
(b)
|
Ethanol
|
(c)
|
Benzene
|
(d)
|
Acetylene
|
28. Which one is used as a low temperature
thermometric liquid?
(a)
|
Methanol
|
(b)
|
Ethanol
|
(c)
|
Benzene
|
(d)
|
Acetylene
|
29. Long chain carboxylic acid (fatty acid)
reacts with glycerol to form triesters called:
(a)
|
Triglycerides
|
(b)
|
Triacyl glycerol
|
(c)
|
Fats and Oils
|
(d)
|
All of the above
|
30. The dehydration of alcohols is an example
of:
(a)
|
Bimolecular elimination/E2 reaction
|
(b)
|
SN2 reaction
|
(c)
|
SN1 reaction
|
(d)
|
Unimolecular elimination/E1 reaction
|
31. Which one is the correct order of
reactivity of different types of alcohol?
(a)
|
1° alcohol > 2° alcohol > 3°
alcohol
|
(b)
|
2°alcohol>1° alcohol > 3° alcohol
|
(c)
|
3° alcohol > 1° alcohol > 2° alcohol
|
(d)
|
3° alcohol > 2° alcohol > 1° alcohol
|
32. Which bond is cleaved hen alcohols are
converted to carbonyl compounds?
(a)
|
O-H bond only
|
(b)
|
Both O-H and C-O bond
|
(c)
|
C-O bond only
|
(d)
|
Both O-H and C-H bond
|
33. Which class of compounds is prepared by
the cleavage of O-H bond of alcohols?
(a)
|
Alkyl halides
|
(b)
|
Amines
|
(c)
|
Carbonyl compounds
|
(d)
|
Esters
|
34. Which class of compounds is prepared by
the cleavage of O-H bond of alcohols?
(a)
|
Alkyl halides
|
(b)
|
Amines
|
(c)
|
Carbonyl compounds
|
(d)
|
Esters
|
35. Which class of compounds cannot be
prepared by the cleavage of O-H bond of alcohols?
(a)
|
Esters
|
(b)
|
Alkanes
|
(c)
|
Alkoxides
|
(d)
|
Alkenes
|
36. Which class of compounds is prepared by
the cleavage of C-O bond of alcohols?
(a)
|
Alkyl halides
|
(b)
|
Amines
|
(c)
|
Carbonyl compounds
|
(d)
|
Esters
|
37. Which class of compounds is prepared by
the cleavage of both C-O and C-H bond of alcohols?
(a)
|
Alkyl halides
|
(b)
|
Amines
|
(c)
|
Carbonyl compounds
|
(d)
|
Ethers
|
38. Which type of reactions alcohols cannot undergo?
(a)
|
Substitution
|
(b)
|
Condensation
|
(c)
|
Elimination
|
(d)
|
Addition
|
39. Which of the following is incorrect
regarding esterification?
(a)
|
It is an acid-catalyzed reversible condensation of an alcohol and
an acid.
|
(b)
|
The esterification equilibrium usually lies on the side of the
ester.
|
(c)
|
A trace of HCl or H2SO4 is used to take up eliminated water.
|
(d)
|
It involves fission of C-O bond of alcohol and O-H bond of acid.
|
40. Which of the following is the structural
formula of alcohol with molecular formula C5H11OH?
(a)
|
CH3–CH2–CH2–CH2–CH2–OH
|
(b)
|
(CH3)2–CH–CH2–CH2–OH
and (CH3)2–C(OH).C2H5
|
(c)
|
CH3–CH2–CH2–CH.(OH).CH3
|
(d)
|
All of the above
|
41. Which one of the following is the general
method of preparation of alcohols?
(a)
|
By the hydrolysis of alkyl halide with aqueous alkali
|
(b)
|
By the hydrolysis of ester with aqueous alkali or carboxylic acid
|
(c)
|
By reduction of aldehydes or ketones by
nascent hydrogen or By catalytic hydration of alkene
|
(d)
|
All of the above
|
42. Which of the following steps is not used
in the fermentation of starch into ethyl alcohol?
(a)
|
Hydrolysis of starch into maltose
by diastase present in barley.
|
(b)
|
Conversion of maltose into glucose
by maltase present in yeast.
|
(c)
|
Conversion of glucose into ethanol
by zymase present in yeast
|
(d)
|
Conversion of sucrose into glucose
and fructose by sucrase present in yeast
|
43. Which of the following statements is
incorrect regarding preparation of alcohols?
(a)
|
Aldehydes and
Ketones on catalytic reduction by [H] give primary alcohol and secondary
alcohol respectively.
|
(b)
|
Ketones on reaction with Grignard’s
reagent gives tertiary alcohol
|
(c)
|
Aldehydes on reaction with
Grignard’s reagent gives primary or secondary alcohol
|
(d)
|
Alkyl halides on reaction
alcoholic potash gives alcohol
|
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