Aldehydes, Ketones and Carboxylic Acids CBSE Class 12 PYQs

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Aldehydes, Ketones and Carboxylic Acids PYQs (previous year questions) for CBSE Class 12: Aldehydes, Ketones and Carboxylic Acids (Chemistry) had 23 questions across the 50 official CBSE Class 12 papers we tagged (2016–2026), and appeared in 10 of them. Asked in 10 of 10 years. The concepts asked in the most papers: Carbonyl Reactions, Carbonyl Identification, Nucleophilic Addition.

Year-wise question count

Asked in 10 of 10 years.

Most-asked concepts

Sorted by the number of papers a concept appeared in.

How to practise Aldehydes, Ketones and Carboxylic Acids PYQs

1. Start with the concepts at the top of the table. They have come back the most.
2. Solve one year’s Aldehydes, Ketones and Carboxylic Acids questions from the official PDF against the clock, then check the answer listed below.
3. Log every miss as a concept gap, a calculation slip or a misread. Each needs a different fix.
4. Once a concept is clean in two papers, move to the next. Then sit a full paper from the year pages.

Questions by year

Each line gives the question number and paper, type, concept, our one-line summary, with a link to the official PDF.

CBSE Class 122026

• Q.26 (Chemistry (56/1/1)) · Short answer · Properties of Carbonyls: Reasons: acid b.p., alpha-H acidity, no addition in strong acid PDF
• Q.31 (Chemistry (56/1/1)) · Long answer · Carbonyl Identification: C5H10O structures from tests; convert acetophenone, ethylbenzene to acid PDF

CBSE Class 122025

• Q.9 (Chemistry (56/1/1)) · MCQ · Preparation of Carboxylic Acids: Acid formed from propyl Grignard reagent and CO2 PDF
• Q.19 (Chemistry (56/1/1)) · Very short answer · Nucleophilic Addition: Benzaldehyde vs propanal reactivity in nucleophilic addition PDF
• Q.33 (Chemistry (56/1/1)) · Long answer · Carbonyl Reactions: Aldol and decarboxylation conversions; identify C5H10 alkene products PDF

CBSE Class 122024

• Q.7 (Chemistry (56/1/1)) · MCQ · Carboxylic Acid Reactions: Product of acetic acid with PCl5 PDF
• Q.8 (Chemistry (56/1/1)) · MCQ · Nucleophilic Addition: Reaction type of cyanohydrin formation from aldehyde PDF
• Q.15 (Chemistry (56/1/1)) · Assertion-Reason · Acidity of Carboxylic Acids: pKa of ethanoic vs chloroacetic acid and -I effect PDF
• Q.21 (Chemistry (56/1/1)) · Very short answer · Named Reactions: Equations for Clemmensen reduction and Cannizzaro reaction PDF
• Q.28 (Chemistry (56/1/1)) · Short answer · Carbonyl Identification: Identify A-F from ester reduction, aldol and oxidation clues PDF

CBSE Class 122023

• Q.29 (Chemistry (56/1/1)) · Short answer · Carboxylic Acids: Why carboxyl is meta directing, bisulphite purification, acid carbonyl PDF
• Q.35 (Chemistry (56/1/1)) · Long answer · Carbonyl Reactions: Aldol and HVZ conversions; identify C5H10 alkene from ozonolysis products PDF

CBSE Class 122022

• Q.9 (Chemistry (56/1/1)) · Short answer · Carbonyl Identification: Identify C5H10O ketone from DNP, iodoform and oxidation clues PDF
• Q.12 (Chemistry (56/1/1)) · Case-based · Carbonyl Reactions: Passage on carbonyls: reactivity order, distinguishing test, acidity, Cannizzaro PDF

CBSE Class 122020

• Q.12 (Chemistry (56/1/1)) · MCQ · Iodoform Test: Which compound does not give the iodoform test PDF
• Q.15 (Chemistry (56/1/1)) · MCQ · Carboxylic Acid Nomenclature: Correct IUPAC name of a branched carboxylic acid PDF
• Q.26 (Chemistry (56/1/1)) · Short answer · Carbonyl Reactions: Propanone with Grignard reagent; Friedel-Crafts acylation of benzene PDF

CBSE Class 122019

• Q.12 (Chemistry (56/1/1)) · Short answer · Carbonyl Reactions: Structures of A and B in oxidation and semicarbazone sequences PDF
• Q.23 (Chemistry (56/1/1)) · Short answer · Carbonyl Reactions: Complete reactions: cyanohydrin, cadmium reagent, HVZ PDF

CBSE Class 122018

• Q.9 (Chemistry (56/1)) · Short answer · Carbonyl Conversions: Convert ethanal to propanone and toluene to benzoic acid PDF
• Q.18 (Chemistry (56/1)) · Short answer · Carbonyl Identification: Identify three C4H8O carbonyl isomers from Tollens and iodoform tests PDF

CBSE Class 122017

• Q.26 (Chemistry (56/1)) · Long answer · Carbonyl Reactions: Products of given reactions; tests for butanal/butanone and benzoic acid/phenol PDF

CBSE Class 122016

• Q.26 (Chemistry (56/1/N)) · Long answer · Carbonyl Reactions: Identify A-D in reaction scheme, distinguish tests, boiling point order PDF

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FAQ

How many Aldehydes, Ketones and Carboxylic Acids questions come in CBSE Class 12?

In the official papers we tagged: 2 in 2026, 3 in 2025, 5 in 2024, 2 in 2023, 2 in 2022, 3 in 2020, 2 in 2019, 2 in 2018, 1 in 2017 and 1 in 2016. That is 23 questions in all, about 8% of Chemistry.

Which Aldehydes, Ketones and Carboxylic Acids topics repeat in CBSE Class 12?

Asked in the most papers: Carbonyl Reactions, Carbonyl Identification, Nucleophilic Addition. The concept table lists every one with its count.

Are these official CBSE Class 12 questions?

Yes. Every question is from an official CBSE Class 12 paper hosted on our year pages. The one-line summaries are ours; open the PDF linked beside each question for the full text.