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NCERT Exemplar · Class 12 · Chemistry

Chapter 12: Aldehydes, Ketones and Carboxylic Acids

Practice each question, then open the answer or worked solution.

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II. Multiple Choice Questions (Type-II)

33 questions
Q43Written answer

Assertion: Compounds containing —CHO group are easily oxidised to corresponding carboxylic acids.

Reason: Carboxylic acids can be reduced to alcohols by treatment with LiAlH4

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Worked solution

Option (v) is correct

Q44Written answer

Assertion: The α-hydrogen atom in carbonyl compounds is less acidic.

Reason: The anion formed after the loss of the α-hydrogen atom is resonance stabilised.

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Worked solution

Option (iv) is correct.

Q45Written answer

Assertion: Aromatic aldehydes and formaldehyde undergo Cannizaro reaction.

Reason: Aromatic aldehydes are almost as reactive as formaldehyde.Solution:

Option (iii) is correct.

46. Assertion: Aldehydes and ketones, both react with Tollen’s reagent to form a silver mirror.

Reason: Both, aldehydes and ketones contain a carbonyl group.

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Worked solution

Option (iv) is correct

Class 12 Chemistry NCERT Exemplar for Aldehydes, Ketones and Carboxylic Acids

Studying the chapter Aldehydes, Ketones and Carboxylic Acids will help you to understand IUPAC names and common names of ketones, aldehydes and carboxylic acids. It will also aid in understanding

  • The structures of the compounds containing functional groups of carboxyl and carbonyl groups.
  • The physical properties and chemical reactions of aldehydes, ketones and carboxylic acids with their structures.
  • Various factors affecting the acidity of carboxylic acids and their reactions.