Learn

Saturday, 31 October

JEE Main · Chemistry · Hydrocarbons

Stereoselective Alkyne Reduction

JEE Main asked Stereoselective Alkyne Reduction 4 times in 4 of the 108 shifts Lumi analysed, in 2021, 2024 and 2026. It belongs to Alkenes and Alkynes, in Hydrocarbons (Chemistry). The longest wait between two years asking it was 3 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 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

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

00.10.20’170’200.03’210’220’230.09’240’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 2 in 18 shifts · 2025: 0 in 8 shifts · 2026: 1 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20261 of 9
  • 20250 of 8
  • 20242 of 18
  • 20230 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.

  • Molar mass of product of reaction sequence
  • Identify alkyne and trans product from reduction

Difficulty

Easy 2Medium 2Hard 0

1 of the 4 questions had a numerical answer.

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. 4 Apr 2026, Shift 2 · Q64Compound (X) is subjected to the sequence of reactions as shown above. Molar mass of the major product (Y) formed is ________…MediumDiagram basedHas a figure
  2. 1 Feb 2024, Shift 2 · Q75In the given reactions identify A and B H2+A→Pd/C\mathrm{H_2 + A \xrightarrow{Pd/C}} [figure: alkene with CH3\mathrm{CH_3} (upper left) and…EasyOtherHas a figure
  3. 6 Apr 2024, Shift 1 · Q88The major product of the following reaction is P. CH3C=C−CH3\mathrm{CH_3C = C - CH_3}…MediumNumerical valueHas a figure
  4. 4 Aug 2021, Shift 1 · Q43Select the most suitable reagent for the following reduction reactionEasySingle correctHas a figure

Shifts: 4 Aug 2021, Shift 1, 1 Feb 2024, Shift 2, 6 Apr 2024, Shift 1, 4 Apr 2026, Shift 2.

Same topic

Other ideas in Alkenes and Alkynes

Alkenes and Alkynes has 24 ideas JEE Main has asked; 14 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas