CN  ChemNexa

Aldehydes, Ketones and Carboxylic Acids JENPAS MCQ & Practice Questions

Practice Aldehydes, Ketones and Carboxylic Acids MCQs for JENPAS 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 JENPAS Chemistry

Aldehydes, Ketones and Carboxylic Acids is part of JENPAS 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 JENPAS 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.

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

1. The functional group of an aldehyde is:

  • A. -CO-
  • B. -OH
  • C. -CHO
  • D. -COOH
Answer: C
Explanation: Aldehydes contain the terminal carbonyl group -CHO.

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

2. The functional group of a ketone is:

  • A. -OH
  • B. -CO- between two carbon groups
  • C. -CHO
  • D. -COOH
Answer: B
Explanation: Ketones contain a carbonyl group bonded to two carbon groups.

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

3. The functional group of a carboxylic acid is:

  • A. -COOH
  • B. -CHO
  • C. -CO-
  • D. -O-
Answer: A
Explanation: Carboxylic acids contain the carboxyl group -COOH.

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

4. The IUPAC name of HCHO is:

  • A. Methanone
  • B. Methanol
  • C. Methanoic acid
  • D. Methanal
Answer: D
Explanation: The one-carbon aldehyde is methanal.

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

5. The IUPAC name of CH3CHO is:

  • A. Ethanol
  • B. Ethanoic acid
  • C. Ethanal
  • D. Ethanone
Answer: C
Explanation: The two-carbon aldehyde is ethanal.

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

6. The IUPAC name of CH3COCH3 is:

  • A. Propanoic acid
  • B. Propanone
  • C. Propanal
  • D. Propanol
Answer: B
Explanation: A three-carbon ketone with carbonyl at C-2 is propanone.

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

7. The IUPAC name of CH3COOH is:

  • A. Ethanoic acid
  • B. Methanoic acid
  • C. Ethanal
  • D. Ethanol
Answer: A
Explanation: CH3COOH is ethanoic acid.

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

8. The carbonyl carbon in aldehydes and ketones is:

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

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

9. The C=O bond is strongly polar because oxygen is:

  • A. Electropositive
  • B. Neutral
  • C. More electronegative than carbon
  • D. Less electronegative than carbon
Answer: C
Explanation: Oxygen withdraws electron density from carbon.

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

10. The carbonyl carbon is susceptible to nucleophilic attack because it bears:

  • A. A full negative charge
  • B. Partial positive charge
  • C. Partial negative charge
  • D. No charge separation
Answer: B
Explanation: Polarisation of C=O leaves carbon electrophilic.

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

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

  • A. They have less steric hindrance and less +I effect
  • B. They have more alkyl groups
  • C. They are less polar
  • D. Ketones lack carbonyl groups
Answer: A
Explanation: Aldehydes are both less hindered and less electron-rich at the carbonyl carbon.

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

12. Addition of HCN to an aldehyde or ketone forms:

  • A. Acetal only
  • B. Oxime
  • C. Hydrazone
  • D. Cyanohydrin
Answer: D
Explanation: CN- adds to the carbonyl, followed by protonation.

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

13. Reaction of carbonyl compounds with hydroxylamine gives:

  • A. Cyanohydrins
  • B. Acetals
  • C. Oximes
  • D. Hydrazones
Answer: C
Explanation: NH2OH converts C=O into C=N-OH derivatives.

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

14. Reaction of aldehydes or ketones with hydrazine gives:

  • A. Esters
  • B. Hydrazones
  • C. Oximes
  • D. Cyanohydrins
Answer: B
Explanation: Hydrazine condenses with carbonyl compounds to form hydrazones.

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

15. Reaction of a carbonyl compound with semicarbazide gives:

  • A. Semicarbazone
  • B. Oxime
  • C. Acetal
  • D. Cyanohydrin
Answer: A
Explanation: Semicarbazide forms crystalline semicarbazones.

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

16. 2,4-DNP test is used to detect:

  • A. Carboxylic acids only
  • B. Alcohols only
  • C. Amines only
  • D. Aldehydes and ketones
Answer: D
Explanation: Carbonyl compounds form yellow/orange 2,4-dinitrophenylhydrazones.

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

17. Tollens' reagent gives a silver mirror with:

  • A. Ethers
  • B. Alkanes
  • C. Aldehydes
  • D. Most ketones
Answer: C
Explanation: Aldehydes reduce Ag+ to metallic silver.

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

18. Fehling's solution is generally reduced by:

  • A. Ethers
  • B. Aliphatic aldehydes
  • C. Most ketones
  • D. Benzene
Answer: B
Explanation: Aliphatic aldehydes reduce Cu2+ to brick-red Cu2O.

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

19. Schiff's reagent gives a characteristic colour with:

  • A. Aldehydes
  • B. Alkanes
  • C. Ethers
  • D. Carboxylate salts only
Answer: A
Explanation: Aldehydes restore the magenta colour of Schiff's reagent.

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

20. Iodoform test is given by compounds containing:

  • A. Only -CHO
  • B. Only -COOH
  • C. Only -NH2
  • D. CH3CO- or CH3CH(OH)- group
Answer: D
Explanation: Methyl ketones and related secondary alcohols give CHI3.

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 JENPAS 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 JENPAS Chemistry

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