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Saturday, 31 October

JEE Main · Chemistry · Hydrocarbons

Halohydrin Formation Regiochemistry

JEE Main asked Halohydrin Formation Regiochemistry 3 times in 3 of the 108 shifts Lumi analysed, in 2021 and 2022. It belongs to Alkenes and Alkynes, in Hydrocarbons (Chemistry). The longest wait between two years asking it was 1 year. In 2022 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
3
in 3 shifts
Years
2 of 8
First asked
2021
last in 2022
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021 and 2022. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.050.10’170’200.03’210.07’220’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 2 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
  • 20222 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.

  • Predict product of reaction sequence
  • Predict product of reaction with stereochemistry

Difficulty

Easy 0Medium 1Hard 2

Every question was multiple choice.

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. 25 Jun 2022, Shift 2 · Q75Amongst the following, the major product of the given chemical reaction is [drawn: six-membered ring containing one O, with a double bond…HardDiagram basedHas a figure
  2. 27 Jul 2022, Shift 2 · Q73Major product ‘B’ of the following reaction sequence is : CH3−C(CH3)=CH−CH3\mathrm{CH_3-C(CH_3)=CH-CH_3} →CH3OHBr2\xrightarrow[\mathrm{CH_3OH}]{\mathrm{Br_2}} A…HardDiagram basedHas a figure
  3. 31 Aug 2021, Shift 1 · Q44Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Treatment of…MediumAssertion–reason

Shifts: 31 Aug 2021, Shift 1, 25 Jun 2022, Shift 2, 27 Jul 2022, 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