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Saturday, 31 October

JEE Main · Chemistry · Alcohols, Phenols and Ethers

Phthalein Dye Test

JEE Main asked Phthalein Dye Test 4 times in 4 of the 108 shifts Lumi analysed, in 2021, 2023 and 2026. It belongs to Alcohols and Phenols, in Alcohols, Phenols and Ethers (Chemistry). The longest wait between two years asking it was 3 years. In 2021 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
3 of 8
First asked
2021
last in 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021, 2023 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.10.20’170’200.07’210’220.07’230’240’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 2 in 24 shifts · 2022: 0 in 24 shifts · 2023: 1 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
  • 20231 of 12
  • 20220 of 24
  • 20212 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: recall.

  • Identify colour in reaction sequence
  • Identify reactants and product of named reaction

Difficulty

Easy 3Medium 1Hard 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. 4 Apr 2026, Shift 1 · Q70Identify the colour of compound 'X' in the sequence of the reaction.MediumDiagram basedHas a figure
  2. 8 Apr 2023, Shift 2 · Q75A compound 'X' when treated with phthalic anhydride in presence of concentrated H2SO4\mathrm{H_2SO_4} yields 'Y'. 'Y' is used as an acid/base…EasySingle correct
  3. 24 Feb 2021, Shift 1 · Q40Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. H2SO4\mathrm{H_2SO_4} followed by treatment…EasySingle correctHas a figure
  4. 26 Aug 2021, Shift 2 · Q50Which one of the following phenols does not give colour when condensed with phthalic anhydride in presence of conc. H2SO4\mathrm{H_2SO_4} ?EasyDiagram basedHas a figure

Shifts: 24 Feb 2021, Shift 1, 26 Aug 2021, Shift 2, 8 Apr 2023, Shift 2, 4 Apr 2026, Shift 1.

Same topic

Other ideas in Alcohols and Phenols

Alcohols and Phenols has 26 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