Aldehydes, Ketones and Carboxylic Acids Class 12 MCQ Online Test With Answers Questions

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.

Class 12 Chemistry Chapter 12 MCQ With Answers

Chemistry Class 12 Chapter 12 MCQs On Aldehydes, Ketones and Carboxylic Acids

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

(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

MCQ Aldehydes And Ketones Class 12 Question 11.
Identify reactant (X) in the given reaction sequence

(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

(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

(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

(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.

The product (X) will be

Answer

Answer: (c)

Question 27.
Find the product of the given reaction

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?

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:

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

Question 34.
Identify the products (X) and (Y) in the given reaction

(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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