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Saturday, 31 October

JEE Main · Chemistry · Hydrocarbons

Reactivity-Selectivity Principle

JEE Main asked Reactivity-Selectivity Principle once in the 108 shifts Lumi analysed, on 26 Aug 2021, Shift 1. It belongs to Alkanes and Free Radicals, in Hydrocarbons (Chemistry).

Updated 2026-10-24

Times asked
1
in 1 shift
Years
1 of 8
First asked
2021
the only year
Pattern
Gone quiet
asked once so far

Questions on this idea a shift, by year

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

00.050.10’170’200.03’210’220’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 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
  • 20240 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

Single correct is the usual form. Skill tested: application.

  • Predict product of reaction

Difficulty

Easy 1Medium 0Hard 0

The question was multiple choice.

Every question

The question

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

  1. 26 Aug 2021, Shift 1 · Q42Excess of isobutane on reaction with Br2\mathrm{Br_2} in presence of light at 125℃ gives which one of the following, as the major product ?EasySingle correctHas a figure

Shift: 26 Aug 2021, 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