Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids MCQs | Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids Multiple Choice Questions (MCQs) and Answers

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Questions
1 Benzoic acid reacts with conc.HNO3 and conc.H2SO4 to give
A o-nitrobenzoic acid
B p-nitrobenzoic acid
C m-nitrobenzoic acid
D o,p-dinitrobenzoic acid

Answer:m-nitrobenzoic acid
2 An inorganic compound producing an organic compound on heating is
A ammonium cyanate
B soda lime
C sodamide
D potassium cyanide

Answer:ammonium cyanate
3 The reaction of ethyl formate with an excess of CH3MgI followed by hydrolysis gives
A ethanol
B n-propyl alcohol
C propanal
D isopropyl alcohol

Answer: isopropyl alcohol
4 Formic acid and acetic acid are distinguished by reaction with
A sodium ethoxide
B sodium
C HgCl2
D 2,4-dinitrophenylhydrazine

Answer: HgCl2
5 Heating a mixture of sodium benzoate and soda lime gives
A calcium benzoate
B benzene
C sodium benzoate
D methane

Answer: benzene
6 A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives
A benzyl alcohol + sodium formate
B sodium benzoate + methanol
C benzyl alcohol + methanol
D sodium benzoate + sodium formate

Answer:benzyl alcohol + sodium formate
7 Which of the following has the most acidic hydrogen?
A hexane-2,4-dione
B hexane-2,3-dione
C hexane-2,5-dione
D hexane-3-one

Answer:hexane-2,4-dione
8 A new C-C bond formation is possible in
A cannizzaro reaction
B friedel crafts reaction
C clemmensen reduction
D reimer tiemann reaction

Answer:friedel crafts reaction
9 Under Wolff-Kishner reduction conditions, the conversions which may be brought about are
A cyclohexanone into cyclohexane
B benzaldehyde into benzyl alcohol
C cyclohexanone into cyclohexanol
D benzophenone into diphenylmethane

Answer:cyclohexanone into cyclohexane
10 The formation of cyanohydrin from a ketone is an example of
A electrophilic addition
B nucleophilic addition
C nucleophilic substitution
D electrophilic substitution

Answer:nucleophilic addition
11 Acetone reacts with iodine (I2) to form iodoform in the presence of
A CaCO3
B NaOH
C KH
D MgCO3

Answer:NaOH
12 Which of the following compounds with molecular formula, C5H10 yields acetone on ozonolysis? 
A 2-methyl-2-butene
B 3-methyl-1-butene
C Cyclopentane
D 2-methyl-1-butene

Answer:2-methyl-2-butene
13 Among acetic acid, phenol and n-hexanol which one of the following compound will react with NaHCO3 solution to give sodium salt and CO2?
A Acetic acid
B n-hexanol
C Acetic acid and phenol
D Phenol

Answer: Acetic acid
14 The reagent used for the separation of acetaldehyde from acetophenone is
A NaHSO3
B C6H5NHNH2
C NH2OH
D NaOH and I2

Answer:NaHSO3
15 Iodoform test is not given by
A 2-pentanone
B ethanol
C ethanal
D 3-pentanone

Answer:3-pentanone
16 Two isomeric ketones 3-Pentanones and 2-pentanone can be distinguished by
A I2/NaOH only
B NaHSO3 only
C NaCN/HCl
D both of (a) and (b)

Answer: both of (a) and (b)
17 Products of the following reaction
A CH3CHO + CH3CH2CHO
B CH3COOH + CH3COCH3
C CH3COOH + HOOC.CH2CH3
D CH3COOH + CO2

Answer: CH3COOH + HOOC.CH2CH3
18 Which alkene on ozonolysis gives CH3CH2CHO and CH3COCH3
A
B CH3CH2CH=CHCH2CH3
C CH3CH2CH=CHCH3
D

Answer:
19 The major organic product formed from the following reaction
A
B
C
D

Answer:
20 Benzoic acid gives benzene on being heated with X and phenol gives benzene on being heated with Y. Therefore, X and Y are respectively
A Sodalime and copper
B Zn dust and NaOH
C Cu and sodalime
D Sodalime and zinc dust

Answer: Sodalime and zinc dust

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