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Saturday, 31 October

JEE Main · Chemistry · Aldehydes, Ketones and Carboxylic Acids

Wolff-Kishner Reduction to Alkanes

JEE Main asked Wolff-Kishner Reduction to Alkanes 4 times in 4 of the 108 shifts Lumi analysed, in 2021, 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 2 years. In 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
3 of 8
First asked
2021
last in 2024
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021, 2023 and 2024. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.050.10’170’200.03’210’220.07’230.09’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 1 in 12 shifts · 2024: 2 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
  • 20242 of 18
  • 20231 of 12
  • 20220 of 24
  • 20211 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Diagram based is the usual form. Skill tested: application.

  • Predict product of reaction sequence
  • Predict product of reaction

Difficulty

Easy 1Medium 3Hard 0

Every question was multiple choice.

Every question

All 4 questions

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

  1. 29 Jan 2024, Shift 1 · Q76The final product A formed in the following multistep reaction sequence isMediumDiagram basedHas a figure
  2. 5 Apr 2024, Shift 1 · Q79Identify 'A' in the following reaction : butan-2-one (CH3−C(=O)−CH2−CH3\mathrm{CH_3-C(=O)-CH_2-CH_3})…EasyDiagram basedHas a figure
  3. 11 Apr 2023, Shift 2 · Q77Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : [figure: skeletal…MediumAssertion–reasonHas a figure
  4. 24 Feb 2021, Shift 2 · Q46[Reaction scheme: reactant →?\xrightarrow{?} product] Which of the following reagent is suitable for the preparation of the product in the…MediumDiagram basedHas a figure

Shifts: 24 Feb 2021, Shift 2, 11 Apr 2023, Shift 2, 29 Jan 2024, Shift 1, 5 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