Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids MCQs | Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids Short Questions and Answers

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Questions
1 Polarisation of electrons in acrolein may be written as
A
B
C
D

Answer:
2 Consider the following reaction;
CH3Br + Mg
compound C is:
A acetic acid
B acetaldehyde
C ethyl alcohol
D formic acid

Answer:ethyl alcohol
3 The conversion of CH3OH to CH3COOH can be brought in by:

A K2Cr2O7/H+
B CO + Rh
C KMnO4
D H3PO4

Answer:CO + Rh
4 Benzaldehyde and acetaldehyde can be distinguished by:
A iodoform test
B 2:4 DNP test
C NH3 reaction
D Wolff-Kishner's reduction

Answer:iodoform test
5 Fehling's solution is:
A acidified copper sulphate solution
B ammoniacal cuprous chloride solution
C copper sulphate, Rochelle salt + NaOH
D none of the above

Answer:copper sulphate, Rochelle salt + NaOH
6 Which compounds will not reduce Fehling's solution?
A Methanal
B Ethanal
C Trichloroethanal
D Benzaldehyde

Answer:Benzaldehyde
7 Acetaldehyde normally reacts with
A only electrophiles
B only nucleophiles
C only free radicals
D both electrophiles and nucleophiles

Answer:only nucleophiles
8 Muscone (an explosive perfume secreted by musk deer) has the structure

Its IUPAC name is:
A 3-methyl cyclopentadecanone
B methyl cyclopentadecan-3-one
C 3-methyl cyclotetradecanone
D 3-methyl cyclohexadecan-3-one

Answer:3-methyl cyclopentadecanone
9 Which of the following has most acidic hydrogen?
A 3-hexanone
B 2,4-hexanedione
C 2,5-hexanedione
D 2,3-hexanedione

Answer: 2,4-hexanedione
10 Which can be reduced to corresponding hydrocarbon by Zn-Hg/conc HCl?
A Butan-2-one
B Acetic acid
C Acetamide
D Ethyl acetate

Answer:Butan-2-one
11 Nucleophilic addition reaction will be most favoured in
A
B (CH3)2C=O
C CH3CH2CHO
D CH3CHO

Answer: CH3CHO
12 The enolic form of acetone contains:
A 9 σ-bonds, 1π-bond and 2 lone pairs
B 8 σ-bonds, 2π-bonds and 2 lone pairs
C 10 σ-bonds, 1π-bond and 1 lone pair
D 9 σ-bonds, 2π-bonds and 1 lone pair

Answer: 9 σ-bonds, 1π-bond and 2 lone pairs
13 In this reaction,

an asymmetric compound is generated. The acid obtained would be
A 50% D + 50% L-isomer
B 20% D + 80% L-isomer
C D-isomer
D L-isomer

Answer:50% D + 50% L-isomer
14 Ethane can be obtained from ethanal in one step by:
A Na-Hg + water
B Zn-Hg + conc.HCl
C aluminium isopropoxide and isopropyl alcohol
D LiAlH4 + ether

Answer:Zn-Hg + conc.HCl
15 Which one of the following compounds on treatment with LiAlH4 will give a product that will give a positive iodoform test?
A CH3CH2CHO
B CH3CH2COOCH3
C CH3CH2OCH2CH3
D CH3COCH3

Answer:CH3COCH3
16 Aldehydes and ketones will not form crystalline derivatives with
A sodium bisulphite
B phenyl hydrazine
C semicarbazide hydrochloride
D dihydrogen sodium phosphate

Answer: dihydrogen sodium phosphate
17 Oxalic acid on treatment with conc. H2SO4 gives:
A CO + H2O2
B H2O +CO+CO2
C HCOOH + CO2
D HCOOH + CO2 +O2

Answer:H2O +CO+CO2
18 Benzene sulphonic acid on treating with P2O5 gives:
A salicylic acid
B benzoic acid
C acid anhydride
D sodium benzoate

Answer: acid anhydride
19 The IUPAC name of crotonaldehyde is:
A propenal
B but-2-en-l-al
C butan-2-en-l-al
D none of these

Answer:but-2-en-l-al
20 The IUPAC name of the CH3COCH(CH3)2 is:
A 4-methyl isopropyl ketone
B 3-methyl-2-butanone
C isopropylmethyl ketone
D 2-methyl-3-butanone

Answer: 3-methyl-2-butanone

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