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Saturday, 31 October

JEE Main · Chemistry · Hydrocarbons

Peroxide Effect (Anti-Markovnikov)

JEE Main asked Peroxide Effect (Anti-Markovnikov) 3 times in 3 of the 108 shifts Lumi analysed, in 2017, 2020 and 2024. It belongs to Alkenes and Alkynes, in Hydrocarbons (Chemistry). The longest wait between two years asking it was 4 years.

Updated 2026-10-24

Times asked
3
in 3 shifts
Years
3 of 8
First asked
2017
last in 2024
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

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

00.510.83’170.08’200’210’220’230.05’240’250’26

Raw count: 2017: 1 in 1 shift · 2020: 1 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 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
  • 20230 of 12
  • 20220 of 24
  • 20210 of 24
  • 20201 of 12
  • 20171 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: multi-step.

  • Count stereoisomers of addition product
  • Order/ranking of boiling points of addition products

Difficulty

Easy 0Medium 3Hard 0

1 of the 3 questions had a numerical answer.

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. 27 Jan 2024, Shift 1 · Q903-Methylhex-2-ene on reaction with HBr in presence of peroxide forms an addition product (A). The number of possible stereoisomers for 'A'…MediumNumerical value
  2. 6 Sep 2020, Shift 2 · Q30The increasing order of the boiling points of the major products A, B and C of the following reactions will be : (a) [figure: but-1-ene,…MediumSingle correctHas a figure
  3. 2 Apr 2017 (offline) · Q583-Methyl-pent-2-ene on reaction with HBr in presence of peroxide forms an addition product. The number of possible stereoisomers for the…MediumSingle correct

Shifts: 2 Apr 2017 (offline), 6 Sep 2020, Shift 2, 27 Jan 2024, Shift 1.

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