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Saturday, 31 October

JEE Main · Chemistry · Biomolecules

Reduction with HI and Red Phosphorus

JEE Main asked Reduction with HI and Red Phosphorus 2 times in 2 of the 108 shifts Lumi analysed, in 2022 and 2026. It belongs to Carbohydrates, in Biomolecules (Chemistry). The longest wait between two years asking it was 4 years.

Updated 2026-10-24

Times asked
2
in 2 shifts
Years
2 of 8
First asked
2022
last in 2026
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

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

00.10.20’170’200’210.03’220’230’240’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 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
  • 20240 of 18
  • 20230 of 12
  • 20221 of 24
  • 20210 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Match the list is the usual form. Skill tested: multi-step.

  • Electron count in product of sequence
  • Match list on reactions of glucose

Difficulty

Easy 0Medium 1Hard 1

Every question was multiple choice.

Every question

All 2 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 · Q69Consider the following reactions. Total number of electrons in the π\pi bonds and lone pair of electrons in the product (X) is : [figure:…HardSingle correctHas a figure
  2. 27 Jul 2022, Shift 2 · Q77Match **List - I** with **List - II**. List - I (A) Glucose + HI (B) Glucose + Br2\mathrm{Br_2} water (C) Glucose + acetic anhydride (D)…MediumMatch the list

Shifts: 27 Jul 2022, Shift 2, 6 Apr 2026, Shift 2.

Same topic

Other ideas in Carbohydrates

Carbohydrates has 25 ideas JEE Main has asked; 13 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas