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Aldehydes, Ketones and Carboxylic Acids CBSE Class 12 MCQ & Practice Questions

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Aldehydes, Ketones and Carboxylic Acids Revision Guide for CBSE Class 12 Chemistry

Aldehydes, Ketones and Carboxylic Acids is part of CBSE Class 12 Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

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Important Topics

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  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

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Top 20 Aldehydes, Ketones and Carboxylic Acids MCQs with Answers

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CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

1. Functional group of aldehydes:

  • A. –COOH
  • B. –CHO
  • C. >C=O
  • D. –OH
Answer: B
Explanation: Aldehydes contain terminal –CHO.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

2. Ketones contain:

  • A. Terminal carbonyl
  • B. Internal carbonyl
  • C. Carboxyl
  • D. Ether
Answer: B
Explanation: Ketones have internal carbonyl.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

3. Carboxylic acids contain:

  • A. –CHO
  • B. –COOH
  • C. –CO–
  • D. –OH only
Answer: B
Explanation: Carboxyl group.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

4. Tollens' reagent oxidises:

  • A. Ketones
  • B. Aldehydes
  • C. Alcohols only
  • D. Ethers
Answer: B
Explanation: Silver mirror test.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

5. Fehling's solution is positive for:

  • A. Aliphatic aldehydes
  • B. Most ketones
  • C. Benzophenone
  • D. Ethers
Answer: A
Explanation: Cu2O red ppt.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

6. Iodoform test is given by:

  • A. Acetaldehyde
  • B. Formaldehyde
  • C. Benzaldehyde
  • D. Formic acid
Answer: A
Explanation: Contains CH3CO-.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

7. Cannizzaro reaction occurs with:

  • A. Aldehydes lacking α-H
  • B. All ketones
  • C. All aldehydes
  • D. Carboxylic acids
Answer: A
Explanation: Disproportionation.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

8. Aldol condensation requires:

  • A. No α-H
  • B. α-H present
  • C. Only ketones
  • D. Only acids
Answer: B
Explanation: Base-catalysed.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

9. Most reactive carbonyl compound:

  • A. Formaldehyde
  • B. Acetone
  • C. Benzophenone
  • D. Acetic acid
Answer: A
Explanation: Least steric hindrance.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

10. Carboxylic acids are more acidic than alcohols due to:

  • A. Resonance stabilized carboxylate
  • B. Higher mass
  • C. More H atoms
  • D. Colour
Answer: A
Explanation: Resonance.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

11. Reduction of aldehyde gives:

  • A. Primary alcohol
  • B. Secondary alcohol
  • C. Acid
  • D. Alkane
Answer: A
Explanation: NaBH4/LiAlH4.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

12. Reduction of ketone gives:

  • A. Primary alcohol
  • B. Secondary alcohol
  • C. Acid
  • D. Ether
Answer: B
Explanation: Hydride reduction.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

13. Oxidation of aldehyde gives:

  • A. Ketone
  • B. Carboxylic acid
  • C. Alcohol
  • D. Ether
Answer: B
Explanation: Easy oxidation.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

14. Ketones resist oxidation because:

  • A. No carbonyl
  • B. No α-H on carbonyl carbon
  • C. Always aromatic
  • D. No oxygen
Answer: B
Explanation: Need C-C cleavage.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

15. Acetic acid formula:

  • A. CH3CHO
  • B. CH3COOH
  • C. HCOOH
  • D. C2H5OH
Answer: B
Explanation: Ethanoic acid.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

16. Formic acid is:

  • A. Methanoic acid
  • B. Ethanoic acid
  • C. Propanoic acid
  • D. Benzoic acid
Answer: A
Explanation: One carbon acid.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

17. Schiff reagent gives pink with:

  • A. Aldehydes
  • B. Ketones
  • C. Acids
  • D. Alcohols
Answer: A
Explanation: Aldehyde test.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

18. 2,4-DNP detects:

  • A. Carbonyl compounds
  • B. Acids
  • C. Alcohols
  • D. Phenols
Answer: A
Explanation: Hydrazone formation.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

19. Benzaldehyde does not undergo:

  • A. Cannizzaro
  • B. Aldol
  • C. Oxidation
  • D. Reduction
Answer: B
Explanation: No α-H.

CBSE Class 12 Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Very Hard

20. Acid chlorides are more reactive than acids due to:

  • A. Better leaving group
  • B. Less carbonyl
  • C. No oxygen
  • D. Higher pH
Answer: A
Explanation: Cl- leaves easily.

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Aldehydes, Ketones and Carboxylic Acids Practice Tests

Aldehydes, Ketones and Carboxylic Acids Frequently Asked Questions

How should I prepare Aldehydes, Ketones and Carboxylic Acids for CBSE Class 12 Chemistry?

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