MCQ Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids with Answers

Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids with Answers Pdf free download. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. We have provided Aldehydes, Ketones and Carboxylic Acids Class 12 Chemistry MCQs Questions with Answers to help students understand the concept very well.

Aldehydes, Ketones and Carboxylic Acids Class 12 MCQs Questions with Answers

Aldehydes, Ketones And Carboxylic Acids MCQ With Answers Pdf Class 12 Question 1.
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

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


Aldehyde Ketone And Carboxylic Acid MCQ Class 12 Question 2.
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

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


MCQ On Aldehydes Ketones And Carboxylic Acids Class 12 Question 3.
The oxidation of toluene to benzaldehyde by chromyl, chloride is called
(a) Etard reaction
(b) Riemer-Tiemann reaction
(c) Wurtz reaction
(d) Cannizzaro’s reaction

Answer

Answer: (a) Etard reaction


Aldehydes, Ketones And Carboxylic Acids MCQ With Answers Pdf Download Question 4.
There is a large difference in the boiling points of butanal and butanal-1-oldueto
(a) intermolecular hydrogen bonding in butan-1-ol
(b) intermolecular hydrogen bonding in butanal
(c) higher molecular mass of butan-1-ol
(d) resonance shown by butanal

Answer

Answer: (a) intermolecular hydrogen bonding in butan-1-ol


Aldehydes And Ketones Class 12 MCQ  Question 5.
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

Answer: (a) nucleophilic addition


Aldehydes Ketones And Carboxylic Acids MCQ With Answers Pdf Class 12 Question 6.
Aldehydes other than formaldehyde react with Grignard’s reagent to give addition products which on hydrolysis give
(a) tertiary alcohols
(b) secondary alcohols
(c) primary alcohols
(d) carboxylic acids

Answer

Answer: (b) secondary alcohols


MCQ On Aldehyde And Ketone Class 12 Question 7.
Which of the following will not give aldol condensation?
(a) Phenyl acetaldehyde
(b) 2-Methylpentanal
(c) Benzaldehyde
(d) 1-Phenylpropanone

Answer

Answer: (c) Benzaldehyde


Class 12 Chemistry Chapter 12 MCQ Question 8.
Which of the following compounds does not react with NaHSO3?
(a) HCHO
(b) C6H5COCH3
(c) CH3COCH3
(d) CH3CHO

Answer

Answer: (b) C6H5COCH3


MCQ Of Aldehyde And Ketone Class 12 Question 9.
Which of the following compounds will ive a coloured crystalline compound with
MCQ Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids with Answers 1
(a) CH3COCl
(b) CH3COOC2H5
(c) CH3COCH3
(d) CH3CONH2

Answer

Answer: (c) CH3COCH3


MCQs On Aldehydes And Ketones Class 12 Question 10.
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

Answer: (c) propanal and methanol


The product of hydrolysis of ozonide of 1-butene are

MCQ Aldehydes And Ketones Class 12 Question 11.
Identify reactant (X) in the given reaction sequence
MCQ Aldehydes And Ketones Class 12
(a) CH3MgCl
(b) CH3COCl +Mg
(c) MgCl2
(d) CH3CH2MgCl

Answer

Answer: (a) CH3MgCl


Aldehydes And Ketones MCQ Class 12 Question 12.
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

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


Aldehydes Ketones And Carboxylic Acids MCQ Class 12 Question 13.
Which of the following compounds will undergo Cannizzaro reaction?
(a) CH3CHO
(b) CH3COCH3
(c) C6H5CHO
(d) C6H5CH2CHO

Answer

Answer: (c) C6H5CHO


MCQs On Aldehydes Ketones And Carboxylic Acids Class 12 Question 14.
Benzoyl Chloride on reduction with H2/Pd-BaSO4 produces
(a) benzoic acid
(b) benzyl alochol
(c) benzoyl sulphate
(d) benzaldehyde

Answer

Answer: (d) benzaldehyde


Aldehyde Ketone And Carboxylic Acid MCQ Pdf Download Class 12 Question 15.
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

Answer: (a) Iodoform test


Aldehydes And Ketones MCQ Pdf Class 12 Question 16.
Which of the following does not undergoCannizzarro’s reaction?
(a) Benzaldehyde
(b) 2-Methylpropanal
(c) p-Methoxybenzaldehyde
(d) 2, 2-Dimethylpropanal

Answer

Answer: (b) 2-Methylpropanal


Question 17.
Aldehydes that do not undergo aldol condensation are
1. propanal
2. trichloroethanal
3. 2-phenylethanal
4. fethanal
5. benzaldehyde
(a) 3 and 4 only
(b) 2 and 5 only
(c) 1, 2 and 3 only
(d) 2, 3 and 5 only

Answer

Answer: (b) 2 and 5 only


Question 18.
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

Answer: (b) Tollen’s reagent


Question 19.
Study the given reaction and identify the process which is carried out
MCQ Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids with Answers 3
(a) It is used for purification of aldehydes and ketones
(b) It is used to distinguish aldehydes from ketones
(c) It is used to prepare cyclic aldehydes and ketones
(d) It is used to study polar nature of aldehydes and ketones

Answer

Answer: (a) It is used for purification of aldehydes and ketones


Question 20.
Hydrocarbons are formed when aldehydes and ketones are reacted with amalgamated zinc and conc. HCl. The reaction is called
(a) Cannizzaro reaction
(b) Clemmensen reduction
(c) Rosenmund reduction
(d) Wolff-Kishner reduction

Answer

Answer: (b) Clemmensen reduction


Question 21.
In the following sequence of reaction, the final product (Z) is
MCQ Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids with Answers 4
(a) ethanal
(b) propan-2-ol
(c) propanone
(d) propan-2-ol

Answer

Answer: (c) propanone


Question 22.
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

Answer: (a) CH3CHO > CH3COCH3 > CH3COC2H5


Question 23.
The final product (Y) in the following sequence of chemical reaction is
MCQ Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids with Answers 5
(a) An alkene
(b) a carboxylic acid
(c) an aldehyde
(d) sodium salt of carboxylic acid

Answer

Answer: (d) sodium salt of carboxylic acid


Question 24.
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

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


Question 25.
Which among the following is most reactive to give nucleophilic addition?
(a) FCH2CHO
(b) ClCH2CHO
(c) BrCH2CHO
(d) ICH2CHO

Answer

Answer: (a) FCH2CHO


Question 26.
MCQ Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids with Answers 6
The product (X) will be
MCQ Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids with Answers 7

Answer

Answer: (c)


Question 27.
Find the product of the given reaction
MCQ Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids with Answers 8

Answer

Answer: (b)


Question 28.
When propanal reacts with 2-methylpropanal in presence of NaOH, four different products are formed. The reaction is known as
(a) Aldol condensation
(b) Cross aldol condensation
(c) Cannizzaro reaction
(d) HVZ condensation

Answer

Answer: (b) Cross aldol condensation


Question 29.
Which of the following does not answer iodoform test?
(a) n-Butyl alcohol
(b) sec-Butyl alcohol
(c) Acetophenone
(d) Acetaldehyde

Answer

Answer: (a) n-Butyl alcohol


Question 30.
Which of the following is the most.reactive isomer?
MCQ Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids with Answers 9

Answer

Answer: (a)


Question 31.
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

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


Question 32.
Fill in the reagents for the given conversation:
MCQ Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids with Answers 10

Answer

Answer: (a)


Question 33.
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

Answer: (c) Aldol


Which compound is obtained when acetaldehydes are treated with dilute solution of caustic soda?

Question 34.
Identify the products (X) and (Y) in the given reaction
MCQ Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids with Answers 11
(a) X = Acetophenone, Y = m-N itroacetophone
(b) X = Toluene, Y = m-Nitroacetotoluene
(c) X = Acetophenone, Y = o- and p-Dinitroacetophenone
(d) X = Benzaldehyde, Y = m-Nitrobenzaldehyde

Answer

Answer: (a) X = Acetophenone, Y = m-N itroacetophone


Question 35.
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

Answer: (d) CH3CH2CHO


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