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Aldehydes, Ketones and Carboxylic Acids Class 12 MCQs Questions with Answers
Solving the Aldehydes, Ketones and Carboxylic Acids Multiple Choice Questions of Class 12 Chemistry Chapter 12 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Aldehydes, Ketones and Carboxylic Acids Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 12 Chemistry Class 12 and cross-check your answers during preparation.
Question 1.
Addition of water to alkynes occurs in acidic medium and in the presence of Hg2+ ions as a catalyst. Which of the following products will be formed on addition of water to but-1 -yne under these conditions?
Answer
Answer:
Question 2.
Which of the following compounds is most reactive towards nucleophilic addition reactions?
Answer
Answer:
Question 3.
The correct order of increasing acidic strength is
(a) Phenol < Ethanol < Chloroacetic acid < Acetic acid
(b) Ethanol < Phenol < Chloroacetic acid < Acetic acid
(c) Ethanol < Phenol < Acetic acid < Chloroacetic acid
(d) Chloroacetic acid < Acetic acid < Phenol < Ethanol
Answer
Answer: (c) Ethanol < Phenol < Acetic acid < Chloroacetic acid
Question 4.
Compound 
can be prepared by the reaction of
(a) Phenol and benzoic acid in the presence of NaOH
(b) Phenol and benzoyl chloride in the presence of pyridine
(c) Phenol and benzoyl chloride in the presence of ZnCl2
(d) Phenol and benzaldehyde in the presence of palladium
Answer
Answer: (b) Phenol and benzoyl chloride in the presence of pyridine
Question 5.
The reagent which does not react with both, acetone and benzaldehyde.
(a) Sodium hydrogensulphite
(b) Phenyl hydrazine
(c) Fehling’s solution
(d) Grignard reagent
Answer
Answer: (c) Fehling’s solution
Question 6.
Cannizzaro’s reaction is not given by
(c) HCHO
(d) CH3CHO
Answer
Answer: (d) CH3CHO
Question 7.
Which product is formed when the compound 
is treated with concentrated aqueous KOH solution?
Answer
Answer:
Question 8.
Structure of ‘A’ and type of isomerism in the above reaction are respectively.
(a) Prop-1-en-2-ol, metamerism
(b) Prop-1 -en-1 -ol, tautomerism
(c) Prop-2-en-2-ol, geometrical isomerism
(d) Prop-1-en-2-ol, tautomerism
Answer
Answer: (d) Prop-1-en-2-ol, tautomerism
Question 9.
Compounds A and C in the following reaction are
(a) identical
(b) positional isomers
(c) functional isomers
(d) optical isomers
Answer
Answer: (b) positional isomers
Question 10.
Which is the most suitable reagent for the following conversion?
(a) Tollen’s reagent
(b) Benzoyl peroxide
(c) l2 and NaOH solution
(d) Sn and NaOH solution
Answer
Answer: (c) l2 and NaOH solution
Question 11.
Which of the following compounds wilt give butanone on oxidation with alkaline KMnO4 solution?
(a) Butan-1-ol
(b) Butan-2-ol
(c) Both of these
(d) None of these
Answer
Answer: (b) Butan-2-ol
Question 12.
In Clemmensen Reduction carbonyl compound is treated with
(a) Zinc amalgam + HCl
(b) Sodium amalgam + HCl
(c) Zinc amalgam + nitric add
(d) Sodium amalgam + HNO3
Answer
Answer: (a) Zinc amalgam + HCl
Assertion and Reason Type Questions
The questions given below consist of an assertion and a reason. Use the following key to choose the appropriate answer.
(a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
(c) Assertion (A) is correct, Reason (R) is wrong statement.
(d) Assertion (A) is wrong, but Reason (R) is correct statement.
Question 13.
Assertion: Formaldehyde is a planar molecule.
Reason: It contains sp² hybridised carbon atom.
Answer
Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
Question 14.
Assertion: Compounds containing -CHO group are easily oxidised to corresponding carboxylic acids.
Reason: Carboxylic acids can be reduced to alcohols by treatment with LiAlH4.
Answer
Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
Question 15.
Assertion: The a-hydrogen atom in carbonyl compounds is less acidic.
Reason: The anion formed after the loss of α-hydrogen atom is resonance stabilised.
Answer
Answer: (d) Assertion (A) is wrong, but Reason (R) is correct statement.
Question 16.
Assertion: Aromatic aldehydes and formaldehyde undergo Cannizzaro reaction.
Reason: Aromatic aldehydes are almost as reactive as formaldehyde.
Answer
Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.
Question 17.
Assertion: Aldehydes and ketones, both react with Tollen’s reagent to form silver mirror.
Reason: Both, aldehydes and ketones contain a carbonyl group.
Answer
Answer: (d) Assertion (A) is wrong, but Reason (R) is correct statement.
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