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Saturday, 31 October

JEE Main · Chemistry · Haloalkanes and Haloarenes

Chiral Centers

JEE Main asked Chiral Centers 12 times in 12 of the 108 shifts Lumi analysed, in 2020, 2022, 2023, 2024 and 2026. It belongs to Stereoisomerism, in Haloalkanes and Haloarenes (Chemistry). The longest wait between two years asking it was 2 years. In 2020, 2022 and 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
12
in 12 shifts
Years
5 of 8
First asked
2020
last in 2026
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2022, 2023, 2024 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.30.60’170.42’200’210.10’220.07’230.09’240’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 5 in 12 shifts · 2021: 0 in 24 shifts · 2022: 3 in 24 shifts · 2023: 1 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
  • 20231 of 12
  • 20223 of 24
  • 20210 of 24
  • 20205 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.

  • Relationship between two wedge-dash structures
  • Count compounds with chiral centres

Difficulty

Easy 4Medium 6Hard 2

8 of the 12 questions had a numerical answer.

Every question

All 12 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 · Q65The following structures are [figure: stereocentre C with Br (up), CH3 (hashed, left), Me (down), Cl (wedge, right)] and [figure:…EasyDiagram basedHas a figure
  2. 1 Feb 2024, Shift 1 · Q89Number of optical isomers possible for 2-chlorobutane ________.EasyNumerical value
  3. 8 Apr 2024, Shift 2 · Q89Total number of optically active compounds from the following is ___________. (1) Fischer projection: CH3\mathrm{CH_3} on top; H-C-OH;…MediumNumerical valueHas a figure
  4. 11 Apr 2023, Shift 2 · Q79Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : A solution of the…MediumAssertion–reason
  5. 29 Jun 2022, Shift 2 · Q88The number of chiral alcohol(s) with molecular formula C4H10O\mathrm{C_4H_{10}O} is _____.MediumNumerical value
  6. 29 Jun 2022, Shift 1 · Q89Observe structures of the following compounds [figure: five structures] The total number of structures/compounds which possess asymmetric…EasyNumerical valueHas a figure
  7. 29 Jul 2022, Shift 2 · Q75Given below are two statements. Statement I: The compound [figure: compound (A), a drawn structure with a stereocentre bearing…MediumTwo statementsHas a figure
  8. 4 Sep 2020, Shift 2 · Q50The number of chiral centres present in threonine is __________.EasyNumerical value
  9. 4 Sep 2020, Shift 1 · Q50The number of chiral centres present in [B] is __________.HardNumerical valueHas a figure
  10. 3 Sep 2020, Shift 1 · Q41Which of the following compounds produces an optically inactive compound on hydrogenation ?HardSingle correctHas a figure
  11. 2 Sep 2020, Shift 1 · Q50The number of chiral carbons present in the molecule given below is ______.MediumNumerical valueHas a figure
  12. 8 Jan 2020, Shift 1 · Q50The number of chiral centres in penicillin is ______.MediumNumerical value

Shifts: 8 Jan 2020, Shift 1, 2 Sep 2020, Shift 1, 3 Sep 2020, Shift 1, 4 Sep 2020, Shift 2, 4 Sep 2020, Shift 1, 29 Jun 2022, Shift 2, 29 Jun 2022, Shift 1, 29 Jul 2022, Shift 2, 11 Apr 2023, Shift 2, 1 Feb 2024, Shift 1, 8 Apr 2024, Shift 2, 4 Apr 2026, Shift 2.

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