Class 12 Chemistry MCQs Aldehydes, Ketones And Carboxylic Acids for JEE/NEET

Here, you will get Class 12 Chemistry MCQ of Chapter 12 Aldehydes, Ketones And Carboxylic Acids for cracking JEE and NEET/AIIMS. By solving these MCQs of Class 12 Chemistry Chapter 12 Aldehydes, Ketones And Carboxylic Acids, you will get the confidence to crack JEE or NEET. Practice MCQ Questions for Class 12 Chemistry with Answers on a daily basis and score well in exams. 

Aldehydes, Ketones And Carboxylic Acids 12 MCQs Questions with Answers

Which of the following reactions will give benzolphenone?
(i) Benzoyl chloride + Benzene + AlCl3
(ii) Benzoyl chloride + Phenylmagnesium bromide
(iii) Benzoyl chloride + Diphenyl cadmium

(a) (i)and(ii)
(b) (ii) and (iii)
(c) (i) and (iii)
(d) (i), (ii) and (iii)

Answer: (c) (i) and (iii)


The addition of HCN to carbonyl compounds is an example of
(a) nucleophilic addition
(b) electrophilic addition
(c) free radical addition
(d) electromeric addition

Answer: (a) nucleophilic addition


Which of the following compounds does not react with NaHSO3?
(a) HCHO
(b) C6H5COCH3
(c) CH3COCH3
(d) CH3CHO

Answer: (b) C6H5COCH3


The product of hydrolysis of ozonide of 1-butene are
(a) ethanol only
(b) ethanal and methanal
(c) propanal and methanal
(d) methanal only

Answer: (c) propanal and methanal


α-Hydroxypropanoic acid can be preapred from ethanal by following the steps given in the sequence
(a) Treat with HCN followed by acidic hydrolysis
(b) Treat with NaHSO3 followed by reaction with Na2CO3
(c) Treat with H2SO4 followed by hydrolysis
(d) Treat with K2Cr2O7 in presence of sulphuric acid

Answer: (a) Treat with HCN followed by acidic hydrolysis


Which of the following acids does not form anhydride?
(a) Formic add
(b) Acetic acid
(c) Propionic add
(d) n-butyric acid

Answer: (a) Formic add


Trans-esterification is a reaction between
(a) two ester molecules
(b) alcohol and carboxylic acid
(c) alcohol and ether
(d) alcohol and ester

Answer: (d) alcohol and ester


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: (c) Dimethyl cadmium


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: (a) two molecules of ethanal


Which of the following compound will undergo self aldol condensation in the presence of cold dilute alkali?
(a) CH ≡ C-CHO
(b) CH2 = CHCHO
(c) C6H5CHO
(d) CH3CH2CHO

Answer: (d) CH3CH2CHO


To differentiate between pentan-2-one and penta-3-one a test is carried out. Which of the following is the correct answer?
(a) Pentan-2-one will give silver mirror test
(b) Pentan-2-one will give iodoform test
(c) Pentan-3-one will give iodoform test
(d) None of these

Answer: (b) Pentan-2-one will give iodoform test


Which compound is obtained when acetaldehydes are treated with dilute solution of caustic soda?
(a) Sodium acetate
(b) Resinous mass
(c) Aldol
(d) Ethyl acetate

Answer: (c) Aldol


Which among the following is most reactive to give nucleophilic addition?
(a) FCH2CHO
(b) ClCH2CHO
(c) BrCH2CHO
(d) ICH2CHO

Answer: (a) FCH2CHO


Which among the following is most reactive to give nucleophilic addition?
(a) FCH2CHO
(b) ClCH2CHO
(c) BrCH2CHO
(d) ICH2CHO

Answer: (a) FCH2CHO


(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: (b) NaOl


Benzaldehyde can be prepared by the hydrolysis of
(a) Benzyl chloride
(b) Benzal chloride
(c) Benzotri chloride
(d) Benzo nitrile

Answer: (b) Benzal chloride


Which of the following does not answer iodoform test?
(a) n-Butyl alcohol
(b) sec-Butyl alcohol
(c) Acetophenone
(d) Acetaldehyde

Answer: (a) n-Butyl alcohol


The reagent used for separation of acetaldehyde and acetophenone is
(a) NaHSO3
(b) C6H5NH NH2
(c) NH2OH
(d) NaOH-I2

Answer: (a) NaHSO3


In order of reactivity of CH3CHO, CH3COC2H5 and CH3COCH3 is
(a) CH3CHO > CH3COCH3 > CH3COC2H5
(b) C2H5COCH3 > CH3COCH3 > CH3CHO
(c) CH3COCH3 > CH3CHO > C2H5COCH3
(d) CH3COCH3 > C2H5COCH3 > CH3CHO

Answer: (a) CH3CHO > CH3COCH3 > CH3COC2H5


Which of the following reagents are not correctly matched with the reaction?
(a) CH3CH = CHCHO → CH3CH = CHCOOH : Ammoniacal AgNO3
(b) CH3CH = CHCHO → CH3CH = CHCH2OH : H2/Pt
(c) R-COOH → R-CH2CH : NaBH4
(d) CH3CH2COCl → CH3CH2CHO : H2Pd/BaSO4

Answer: (b) CH3CH = CHCHO → CH3CH = CHCH2OH : H2/Pt


The best oxidising agent- for oxidation of
CH3-CH = CH-CHO to CH3-CH = CH-COOH is
(a) Baeyefs reagent
(b) Tollen’s reagent
(c) SchifFs reagent
(d) Acidified dichromate

Answer: (b) Tollen’s reagent


What is the test to differentiate between penta-2-one and pentan-3-one?
(a) Iodoform test
(b) Benedict’s test
(c) Fehling’s test
(d) Aldol condensation test

Answer: (a) Iodoform test


Which of the following will not give aldol condensation?
(a) Phenyl acetaldehyde
(b) 2-Methylpentanal
(c) Benzaldehyde
(d) 1-Phenylpropanone

Answer: (c) Benzaldehyde


The addition of HCN to carbonyl compounds is an example of
(a) nucleophilic addition
(b) electrophilic addition
(c) free radical addition
(d) electromeric addition

Answer: (a) nucleophilic addition


Propanone can be prepared from ethyne by
(a) passing a mixture of ethyne and steam over a catalyst, magnesium at 420°C
(b) passing a mixture of ethyne and ethanol over a catalyst zinc chromite
(c) boiling ethyne with water in the presence of HgSO4 and H2SO4
(d) treating ethyne with iodine and NaOH

Answer: (c) boiling ethyne with water in the presence of HgSO4 and H2SO4


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