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Aldehydes, Ketones, and Carboxylic Acids Class 12 MCQs Questions with Answers
Question 1.
Which of the following cannot reduce Fehling’s solution?
(a) Formic acid
(b) Acetic acid
(c) Formaldehyde
(d) Acetaldehyde
Answer
Answer: (b) Acetic acid
Question 2.
Which of the following acids does not form anhydride?
(a) Formic add
(b) Acetic acid
(c) Propionic add
(d) n-butyric acid
Answer
Answer: (a) Formic add
Question 3.
The acid which does not contain-COOH group is
(a) Ethanoic acid
(b) Lactic acid
(c) Picric add
(d) Palmitic acid
Answer
Answer: (c) Picric add
Question 4.
Trans-esterification is a reaction between
(a) two ester molecules
(b) alcohol and carboxylic acid
(c) alcohol and ether
(d) alcohol and ester.
Answer
Answer: (d) alcohol and ester.
Question 5.
Acetone on heating with ammonia produces
(a) Acetaldehyde
(b) Diacetone alcohol
(c) Diacetoneamine
(d) Hydrobenzamide
Answer
Answer: (c) Diacetoneamine
Question 6.
Methyl ketones are usually characterised through
(a) Tollen’s reagent
(b) Iodoform test
(c) Schiff’stest
(d) Benedict solution test.
Answer
Answer: (b) Iodoform test
Question 7.
Which of the following reagents can be used to prepare ketone from acid chloride?
(a) Grignard’s reagent
(b) LiAlH4
(c) Dimethyl cadmium
(d) Cadmium chloride
Answer
Answer: (c) Dimethyl cadmium
Question 8.
HVZ reaction is used to prepare
(a) ß-haloacid
(b) α-haloacid
(c) α, ß-unsaturated add
(d) None of these
Answer
Answer: (b) α-haloacid
Question 9.
An alkene C7H14 on reductive ozonolysis gives an aldehyde with formula C3H6O and and a ketone. The ketone is
(a) 2-butanone
(b) 2-pentanone
(c) 3-pentanone
(d) propanone
Answer
Answer: (a) 2-butanone
Question 10.
Acetaldol is a condensation product of
(a) two molecules of ethanal
(b) two molecules of propanone
(c) ethanal and methanal
(d) ethanal and propanone.
Answer
Answer: (a) two molecules of ethanal
Question 11.
The reagent used for separation of acetaldehyde and acetophenone is
(a) NaHSO3
(b) C6H5NH NH2
(c) NH2OH
(d) NaOH-I2
Answer
Answer: (a) NaHSO3
Question 12.
Chlorination of toluene in the presence of light and heat followed by treatment with aqueous NaOH gives
(a) o-Cresol
(b) p-Cresol
(c) 2,4-Dihdroxytoluene
(d) Benzyl alcohol
Answer
Answer: (d) Benzyl alcohol
Question 13.
Hydrogenation of bezoyl chloride in the presence of Pd supported on BaSO4 gives
(a) Benzyl alcohol
(b) Benzaldehyde
(c) Benzoic acid
(d) Phenol
Answer
Answer: (b) Benzaldehyde
Question 14.
(CH3)2 C = CHCOCH3 cap be oxidised to (CH3)2 = CHCOOH by
(a) Chromic acid
(b) NaOl
(c) Cu at 575 K
(d) KMnO4
Answer
Answer: (b) NaOl
Question 15.
Which of the following reaction canhsfbe used for the reduction
(a) Clemmensen reaction
(b) Wolft-Kishner reaction
(c) Wurtz reaction
(d) HI and red phosphorus.
Answer
Answer: (c) Wurtz reaction
Question 16.
Benzaldehyde can be prepared by the hydrolysis of
(a) Benzyl chloride
(b) Benzal chloride
(c) Benzotri chloride
(d) Benzo nitrile.
Answer
Answer: (b) Benzal chloride
Question 17.
Which of the following acids has the smallest dissociation constant?
(a) CH3CHFCOOH
(b) FCH2CH2COOH
(c) BICH2CH2COOH
(d) CH3CHBrCOOH
Answer
Answer: (c) BICH2CH2COOH
Question 18.
The most suitable reagent for the conversion of R-CH2OH → RCHOis
(a) KMnO4
(b) K2Cr2O7
(c) CrO3
(d) PCC (Pyridimium chlorochromate)
Answer
Answer: (d) PCC (Pyridimium chlorochromate)
Question 19.
Which one the following can be oxidized to the corresponding carbonyl compound?
(a) 2-Hydroxypropane
(b) o-Nitrophenol
(c) Phenol
(d) 2-Hydroxy-2-methyl propane
Answer
Answer: (a) 2-Hydroxypropane
Question 20.
In the reaction
(a) HNO3
(b) O2
(c) O3
(d) KMnO4
Answer
Answer: (c) O3
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