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Saturday, 31 October

JEE Main · Chemistry · Haloalkanes and Haloarenes

Kucherov Alkyne Hydration

JEE Main asked Kucherov Alkyne Hydration 4 times in 4 of the 108 shifts Lumi analysed, in 2020, 2021, 2025 and 2026. It belongs to Alkenes and Alkynes, in Haloalkanes and Haloarenes (Chemistry). The longest wait between two years asking it was 4 years.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
4 of 8
First asked
2020
last in 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2025 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.10.20’170.08’200.03’210’220’230’240.13’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 in 18 shifts · 2025: 1 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
  • 20251 of 8
  • 20240 of 18
  • 20230 of 12
  • 20220 of 24
  • 20211 of 24
  • 20201 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: multi-step.

  • Identify compounds in reaction sequence
  • Identify carbonyl not obtainable by alkyne hydration

Difficulty

Easy 1Medium 3Hard 0

Every question was multiple choice.

Every question

All 4 questions

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

  1. 6 Apr 2026, Shift 2 · Q65An optically active alkyl bromide C4H9Br\mathrm{C_4H_9Br}, reacts with ethanolic KOH to form major compound [A] which reacts with bromine to…MediumSingle correct
  2. 2 Apr 2025, Shift 1 · Q66An optically active alkyl halide C4H9Br\mathrm{C_4H_9Br} [A] reacts with hot KOH dissolved in ethanol and forms alkene [B] as major product…MediumSingle correct
  3. 24 Feb 2021, Shift 2 · Q44Which one of the following carbonyl compounds cannot be prepared by addition of water on an alkyne in the presence of HgSO4\mathrm{HgSO_4}…EasySingle correctHas a figure
  4. 9 Jan 2020, Shift 1 · Q43The major product (Y) in the following reactions is : CH3−CH(CH3)−C≡CH\mathrm{CH_3-CH(CH_3)-C{\equiv}CH}…MediumDiagram basedHas a figure

Shifts: 9 Jan 2020, Shift 1, 24 Feb 2021, Shift 2, 2 Apr 2025, Shift 1, 6 Apr 2026, 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