Alcohols phenols and ethers class 12 MCQ

The NCERT MCQ Questions for Class 12 Chemistry Chapter 11 Alcohols, Phenols, and Ethers with Answers that we have created covers the whole curriculum. To increase your test performance, practice the MCQs for Class 12 Chemistry with Answers daily. Please refer to the whole explanation and the Class 12 MCQs for Alcohols, Phenols, and Ethers supplied here.

Alcohols, Phenols, and Ethers Class 12 MCQs Questions with Answers

Question 1.
Among the following compounds, strongest acid is
(a) H-C = C-H
(b) C₆H₆
(c) C₂H₆
(d) CH₃OH

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Answer: (d) CH₃OH

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Question 2.
1-Propanol and 2-propanol can be best distinguished by
(a) Oxidation with KMnO₄ followed by reaction with Fehling solution?
(b) Oxidation with acidic dichromate followed by reaction with Fehling solution.
(c) Oxidation by heating with copper followed by reaction with Fehling solution.
(d) Oxidation with cone. H₂SO₄ followed by reaction with Fehling solution.

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Answer: (c) Oxidation by heating with copper followed by reaction with Fehling solution.

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Question 3.
The compound which gives the most stable carbonium ion on dehydration is
(a) (CH₃)₂CHCH₂OH
(b) (CH₃)₃COH
(c) CH₃CH₂CH₂CH₂OH
(d) CH₃CH OH CH₂ CH₃

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Answer: (b) (CH3)3COH

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Answer: (b) (CH₃)₃COH

Question 4.
In the following compounds:

The order of acidity is
(a) III > IV > I > II
(b) I > IV > III > II
(c) II > I > III > IV
(d) IV > III > I > II

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Answer: (d) IV > III > I > I
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Answer: (d) IV > III > I > II

Question 5.
In CH₃ CH₂ OH, the bond that undergoes heterolytical change most readily is
(a) C-C
(b) C-O
(c) C-H
(d) O-H

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Answer: (d) O-H
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Question 6.
Phenol reacts with Br₂ in CS₂ at low temperature to give
(a) o-Bromophenol
(b) o-and p-promophenols
(c) p-Bromophenol
(d) 2, 4, 6Tribromophenol

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Answer: (b) o-and p-promophenols
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Question 7.
In the reaction of phenol with CHCl₃ and aqueous NaOH at 343 K, the electrophile attacking the ring is:
(a) CHCl₃
(b) CHCl₂
(c) CCl₂
(d) COCl₂

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Answer: (c) CCl2
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Question 8.
Which of the following is most acidic?
(a) Phenol
(b) Benzyl alcohol
(c) m-chlorophenol
(d) cyclohexanol

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Answer: (c) m-chlorophenol
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Question 9.
The correct order of boiling points for primary (1°), Secondary (2°) and Tertiery (3°) alcohols is
(a) 1° > 2° > 3°
(b) 3° > 2° > 1°
(c) 2° > 1° > 3°
(d) 2° > 3° > 1°

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Answer: (a) 1° > 2° > 3°
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Question 10.
When Phenol is distilled with zinc dust, it gives
(a) Benzene
(b) Toluene
(c) Benzaldehyde
(d) Benzoic acid

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Answer: (a) Benzene
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Question 11.
In the following reaction

(a) ethane
(b) ethylene
(c) butane
(d) propane

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Answer: (a) ethane
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Question 12.
Which of the following cannot be made by using Williamson Synthesis:
(a) Methoxybenzene
(b) Benzyl p-nitrophenyl ether
(c) tert. butyl methyl ether
(d) Ditert. butyl ether

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Answer: (d) Ditert. butyl ether
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Question 13.
The I.U.P.A.C. name of the ether CH₂ = CH-CH₂O CH₃ is
(a) Alkyl methyl ether
(b) l-Methoxy-2-propene
(c) 3-Methoxy-l-propene
(d) Vinyl dimethyl ether

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Answer: (c) 3-Methoxy-l-propene
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Question 14.
Dehydration of alcohol to ethers is catalysed by
(a) cone. H₂SO₄ at 413 K
(b) Hot NaOH
(c) Hot HBr
(d) Hot HNO₃

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Answer: (a) cone. H2S04 at 413 K
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Question 15.
Ethers are
(a) Neutral
(b) Basic
(c) Acidic
(d) Amphoteric

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Answer: (b) Basic
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Question 16.
The ether

when treated with HI produces

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Answer: (a)
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Question 17.
Among the following, the one which reacts most readily with ethanol is
(a) p-Nitrobenzyl bromide
(b) p-Chlorobenzyl bromide
(c) p-methoxybenzyl bromide
(d) p-methyl benzyl bromide.

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Answer: (c) p-methoxybenzyl bromide
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Question 18.
The major product formed by the reaction:

(a) CH₃.CHCH₃.CH₂OCH₃
(b) CH₃ CH (OCH₃) CH₂ CH₃

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Answer: (c)
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Question 19.
tert-Butyl methyl ether on heating with HI gives a mixture of
(a) tert-Butyl alcohol and methyl iodide.
(b) tert-Butyl iodide and methanol
(c) Isobutylene and methyl iodide
(d) Isobutylene and methanol.

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Answer: (b) tert-Butyl iodide and methanol
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Question 20.

(a) C₆H₅OC₂H₅
(b) C₂H₅OC₂H₅
(c) C₆H₅OC₆H₅
(d) C₆H₅I

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Answer: (b) C2H5OC2H5
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Question 21.
An ether is more volatile than alcohol having the same molecular formula. This is due to
(a) intermolecular hydrogen bonding in alcohols.
(b) dipolar character of ethers
(c) alcohols, having resonance structures
(d) intermolecular hydrogen bonding in ethers.

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Answer: (a) intermolecular hydrogen bonding in alcohols
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Question 22.

(a) CH₃CH Br CH₃
(b) CH₃ CH₂ CH₂ Br Br
(c) CH₂ = CH-Br
(d) Br CH = CH-CH₃

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Answer: (a) CH3CH Br CH3
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Question 23.
Strength of acidity is in order:

(a) II > I > III > IV
(b) III > IV > I > II
(c) I > IV > III > n
(d) IV > III > I > II

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Answer: (b) III > IV > I > II
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Question 24.
Cyclohexene is best prepared from cyclohexanol by which of the following:
(a) cone. H₃PO₄
(b) Cone. HCl/ZnCl₂
(c) Cone. HCl
(d) Cone. HBr

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Answer: (a) cone. H3PO4
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Question 25.
Wood spirit is known as acetone
(a) methanol
(b) ethanol
(c) acetone
(d) benzene

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Answer: (a) methanol
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Question 26.
Acetone reacts with Grignard reagent to form
(a) 3° alcohol
(b) 2° alcohol
(c) ether
(d) no reaction

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Answer: (a) 3° alcohol
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Question 27.
The product of acid catalysed hydration of 2-phenylpropene is
(a) 3-Phenyl-2-propanol
(b) 1-Phenyl-2-propanol
(c) 2-phenyl-2-propanol
(d) 2-phenyl-1-propanol.

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Answer: (a) 3-Phenyl-2-propanol
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Question 29.
Acid-cataylysed hydration of alkenes except ethene leads to the formation of
(a) primary alcohol
(b) secondary or tertiary alcohol
(c) mixture of primary and secondary alcohols.
(d) mixture of secondary and tertiary alcohols.

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Answer: (b) secondary or tertiary alcohol
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Question 30.
During dehydration of alcohols to alkenes by heating with cone. H₂SO₄ the initial step is
(a) formation of an ester
(b) protonation of alcohol molecule
(c) formation of carbocation
(d) elimination of water

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Answer: (b) protonation of alcohol molecule
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