JEE Main · Chemistry · Aldehydes, Ketones and Carboxylic Acids
Alpha-Hydrogen Acidity
JEE Main asked Alpha-Hydrogen Acidity 2 times in 2 of the 108 shifts Lumi analysed, in 2022 and 2025. It belongs to Aldol and Cannizzaro, in Aldehydes, Ketones and Carboxylic Acids (Chemistry). The longest wait between two years asking it was 3 years.
Updated 2026-10-24
- Times asked
- 2
- in 2 shifts
- Years
- 2 of 8
- First asked
- 2022
- last in 2025
- Pattern
- Occasional
- across the analysed shifts
Questions on this idea a shift, by year
2017–2026. Asked in 2022 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.
Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 in 18 shifts · 2025: 1 in 8 shifts · 2026: 0 in 9 shifts.
Shift by shift
Each square is one analysed shift, in date order. Open a filled one for that paper.
How JEE Main framed it
Diagram based is the usual form. Skill tested: application.
- Statement i/ii on aldehyde reactions
- Predict product of reaction
Difficulty
Every question was multiple choice.
Every question
All 2 questions
From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.
- 2 Apr 2025, Shift 1 · Q68Given below are two statements : Statement (I) : Vanillin ([structure: benzene ring with -CHO, -OH para to CHO and -OCH3 ortho to OH])…MediumTwo statementsHas a figure
- 27 Jul 2022, Shift 2 · Q72The structure of A in the given reaction is : [figure: R-C(=O)-CH3 treated with NaOH and CH3CH2-Br (drawn as zigzag line with Br); product…MediumDiagram basedHas a figure
Shifts: 27 Jul 2022, Shift 2, 2 Apr 2025, Shift 1.
Same topic
Other ideas in Aldol and Cannizzaro
Aldol and Cannizzaro has 9 ideas JEE Main has asked; 8 of them came up in more than one question.
- Intramolecular Aldol5× · 2025
- Cannizzaro Reaction5× · 2024
- Self-Aldol Condensation4× · 2026
- Cross-Aldol Condensation3× · 2024
- Intramolecular Cannizzaro Reaction2× · 2026
- Claisen-Schmidt Condensation2× · 2024
- Haloform Interference with Aldol2× · 2021
- Cross-Cannizzaro Reactiononce · 2021