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Saturday, 31 October

JEE Main · Chemistry · Haloalkanes and Haloarenes

Counting Optical Isomers

JEE Main asked Counting Optical Isomers 2 times in 2 of the 108 shifts Lumi analysed, all in 2024. It belongs to Stereoisomerism, in Haloalkanes and Haloarenes (Chemistry). In 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
2
in 2 shifts
Years
1 of 8
First asked
2024
the only year
Pattern
New since 2024
across the analysed shifts

Questions on this idea a shift, by year

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

00.050.10’170’200’210’220’230.09’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 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
  • 20230 of 12
  • 20220 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

Numerical value is the usual form. Skill tested: multi-step.

  • Count optically active chlorination products
  • Count optical isomers of compound

Difficulty

Easy 0Medium 0Hard 2

2 of the 2 questions had a numerical answer.

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.

  1. 30 Jan 2024, Shift 2 · Q882-chlorobutane + Cl2→C4H8Cl2\mathrm{Cl_2} \to \mathrm{C_4H_8Cl_2} (isomers) Total number of optically active isomers shown by…HardNumerical value
  2. 8 Apr 2024, Shift 1 · Q88The number of optical isomers in following compound is:__________ [figure: three fused cyclohexane rings in a linear (anthracene-type)…HardNumerical valueHas a figure

Shifts: 30 Jan 2024, Shift 2, 8 Apr 2024, Shift 1.

Same topic

Other ideas in Stereoisomerism

Stereoisomerism has 11 ideas JEE Main has asked; 4 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas