CN  ChemNexa

Aldehydes, Ketones and Carboxylic Acids NEET MCQ & Practice Questions

Practice Aldehydes, Ketones and Carboxylic Acids MCQs for NEET Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

Register Free for Full Chemistry Practice

Aldehydes, Ketones and Carboxylic Acids Revision Guide for NEET Chemistry

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

Use the sample MCQs on this page to check understanding, then attempt the related ChemNexa tests for broader practice. When an answer is wrong, review the explanation and return to the underlying concept before attempting another set.

Important Topics

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

Revision Tip

Create a one-page summary of trends, structures, reactions, exceptions and key terminology for Aldehydes, Ketones and Carboxylic Acids, then test recall with mixed MCQs.

What to practise in Aldehydes, Ketones and Carboxylic Acids

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Aldehydes, Ketones and Carboxylic Acids before attempting MCQs.

Exam-style MCQs

Use chapter-focused multiple-choice practice to improve accuracy, recall and application for NEET Chemistry.

Performance Practice

Attempt ChemNexa tests, review results and return to weak areas for another round of targeted revision.

Top 20 Aldehydes, Ketones and Carboxylic Acids MCQs with Answers

These public questions are selected from the exact Aldehydes, Ketones and Carboxylic Acids chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

1. The carbonyl carbon in aldehydes and ketones is:

  • A. sp hybridised
  • B. dsp2 hybridised
  • C. sp2 hybridised
  • D. sp3 hybridised
Answer: C
Explanation: The carbonyl carbon is trigonal planar and sp2 hybridised.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

2. Aldehydes are generally more reactive than ketones toward nucleophilic addition because:

  • A. They are less polar
  • B. They have less steric hindrance and weaker +I effect
  • C. They have greater steric hindrance
  • D. They contain two alkyl groups
Answer: B
Explanation: Aldehydes are less hindered and their carbonyl carbon is more electrophilic.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

3. HCN adds to aldehydes and ketones to form:

  • A. Cyanohydrins
  • B. Oximes
  • C. Hydrazones
  • D. Acetals
Answer: A
Explanation: CN− attacks the carbonyl carbon and protonation yields a cyanohydrin.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

4. Reaction of a carbonyl compound with NH2OH gives:

  • A. Hydrazone
  • B. Semicarbazone
  • C. Cyanohydrin
  • D. Oxime
Answer: D
Explanation: Hydroxylamine condenses with the carbonyl group to form an oxime.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

5. Aldehydes give a positive Tollens' test because they:

  • A. Form AgCl
  • B. Release hydrogen
  • C. Reduce Ag+ to metallic silver
  • D. Oxidise silver metal
Answer: C
Explanation: Aldehydes are oxidised while Ag+ is reduced to silver.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

6. Which compound gives a positive iodoform test?

  • A. Formic acid
  • B. Propanone
  • C. Methanal
  • D. Benzaldehyde
Answer: B
Explanation: Methyl ketones containing CH3CO− give iodoform.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

7. Benzaldehyde does not undergo aldol condensation because it:

  • A. Lacks an alpha hydrogen
  • B. Is aromatic
  • C. Contains oxygen
  • D. Is insoluble in water
Answer: A
Explanation: Aldol condensation requires an alpha hydrogen for enolate formation.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

8. Aldehydes lacking alpha hydrogen undergo:

  • A. Aldol condensation
  • B. Claisen condensation
  • C. Kolbe reaction
  • D. Cannizzaro reaction
Answer: D
Explanation: They disproportionate in concentrated alkali.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

9. Clemmensen reduction converts a carbonyl group into:

  • A. Oxime using NH2OH
  • B. Acid using KMnO4
  • C. Methylene using Zn(Hg)/HCl
  • D. Alcohol using NaBH4
Answer: C
Explanation: The carbonyl group is reduced to CH2 under acidic conditions.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

10. Wolff-Kishner reduction uses:

  • A. Tollens' reagent
  • B. Hydrazine and strong base
  • C. Zn(Hg)/HCl
  • D. NaBH4
Answer: B
Explanation: Hydrazone formation followed by strong base converts C=O to CH2.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

11. NaBH4 reduces aldehydes and ketones mainly to:

  • A. Alcohols
  • B. Carboxylic acids
  • C. Alkanes
  • D. Alkenes
Answer: A
Explanation: Hydride addition gives primary or secondary alcohols.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

12. Rosenmund reduction converts:

  • A. Nitriles to amines
  • B. Ketones to alcohols
  • C. Acids to alkanes
  • D. Acid chlorides to aldehydes
Answer: D
Explanation: Poisoned Pd/BaSO4 stops reduction at the aldehyde stage.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

13. Stephen reduction converts nitriles into:

  • A. Alcohols
  • B. Carboxylic acids
  • C. Aldehydes after hydrolysis
  • D. Ketones
Answer: C
Explanation: The iminium salt formed is hydrolysed to an aldehyde.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

14. Hydration of ethyne in HgSO4/H2SO4 gives:

  • A. Ethene
  • B. Ethanal
  • C. Ethanol
  • D. Ethanoic acid
Answer: B
Explanation: The enol tautomerises to ethanal.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

15. Hydration of propyne in HgSO4/H2SO4 gives:

  • A. Propanone
  • B. Propanal
  • C. Propan-1-ol
  • D. Propanoic acid
Answer: A
Explanation: The enol tautomerises to propanone.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

16. Carboxylic acids are acidic because their conjugate bases are:

  • A. Highly unstable
  • B. Nonpolar
  • C. Unable to solvate
  • D. Resonance-stabilised
Answer: D
Explanation: The negative charge is delocalised over two oxygen atoms.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

17. Electron-withdrawing groups on carboxylic acids generally:

  • A. Have no effect
  • B. Convert them into bases
  • C. Increase acidity
  • D. Decrease acidity
Answer: C
Explanation: They stabilise the carboxylate ion through the −I effect.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

18. The acidity order is:

  • A. CHCl2COOH > CCl3COOH > CH3COOH > CH2ClCOOH
  • B. CCl3COOH > CHCl2COOH > CH2ClCOOH > CH3COOH
  • C. CH3COOH > CH2ClCOOH > CHCl2COOH > CCl3COOH
  • D. All are equal
Answer: B
Explanation: More chlorine atoms strengthen the −I effect and increase acidity.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

19. Esterification of a carboxylic acid with an alcohol is catalysed by:

  • A. Concentrated H2SO4
  • B. NaOH
  • C. NH3
  • D. NaCl
Answer: A
Explanation: Acid catalysis activates the carbonyl group and helps remove water.

NEET Chemistry · Aldehydes, Ketones and Carboxylic Acids · Very Hard

20. Hydrolysis of an ester in base is called:

  • A. Hydrogenation
  • B. Ozonolysis
  • C. Decarboxylation
  • D. Saponification
Answer: D
Explanation: Base hydrolysis gives a carboxylate salt and alcohol.

Login to Start Full Test

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 NEET Chemistry?

Revise the core concepts first, make a short list of important relationships or exceptions, and then solve chapter-focused MCQs while reviewing every error.

How can ChemNexa help with Aldehydes, Ketones and Carboxylic Acids practice?

This page provides public sample questions and links to published ChemNexa tests so you can combine quick revision with structured practice.

What should I do after getting an MCQ wrong?

Identify whether the mistake came from a concept gap, calculation, unit, sign, wording or memory error, review that point, and then attempt a similar question again.

Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.

Continue NEET Chemistry

View all NEET chapters and testsBrowse all Chemistry PracticeCreate a free account