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Saturday, 31 October

JEE Main · Chemistry · Aldehydes, Ketones and Carboxylic Acids

Clemmensen Reduction to Alkanes

JEE Main asked Clemmensen Reduction to Alkanes 3 times in 3 of the 108 shifts Lumi analysed, in 2022, 2023 and 2024. It belongs to Alkanes and Free Radicals, in Aldehydes, Ketones and Carboxylic Acids (Chemistry). The longest wait between two years asking it was 1 year.

Updated 2026-10-24

Times asked
3
in 3 shifts
Years
3 of 8
First asked
2022
last in 2024
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2022, 2023 and 2024. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.050.10’170’200’210.03’220.07’230.05’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 1 in 24 shifts · 2023: 1 in 12 shifts · 2024: 1 in 18 shifts · 2025: 0 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.

  • 20260 of 9
  • 20250 of 8
  • 20241 of 18
  • 20231 of 12
  • 20221 of 24
  • 20210 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Other is the usual form. Skill tested: multi-step.

  • Zn-hg/hcl reduces both cho and c=o to alkyl groups, pick drawn product
  • Predict product of reaction

Difficulty

Easy 1Medium 2Hard 0

Every question was multiple choice.

Every question

All 3 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 4 Apr 2024, Shift 1 · Q79Identify the product in the following reaction : [reactant: benzene ring with a CHO group and, meta to it, a COCH3 group…EasyOtherHas a figure
  2. 11 Apr 2023, Shift 2 · Q76The major product formed in the following reaction is C6H5−CH(OH)−CH(CH3)−CH2CHO\mathrm{C_6H_5-CH(OH)-CH(CH_3)-CH_2CHO}…MediumOtherHas a figure
  3. 25 Jul 2022, Shift 2 · Q76CH3−CH2−CN\mathrm{CH_3-CH_2-CN} --(CH3MgBr\mathrm{CH_3MgBr}, Ether)--> A --(H3O+\mathrm{H_3O^+})--> B --(Zn-Hg, HCl)--> C The correct structure of C isMediumOther

Shifts: 25 Jul 2022, Shift 2, 11 Apr 2023, Shift 2, 4 Apr 2024, Shift 1.

Same topic

Other ideas in Alkanes and Free Radicals

Alkanes and Free Radicals has 18 ideas JEE Main has asked; 11 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas