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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedEasyRecall

JEE Main 26 August 2021, Shift 2, Chemistry Q50

Question 50 of 90 in this shift, Chemistry question 20 of 30, Section A.

Which one of the following phenols does not give colour when condensed with phthalic anhydride in presence of conc. H2SO4\mathrm{H_2SO_4} ?

The figure, in words

All four options are drawn benzene rings with OH / CH3 substituents; described in option texts.
  1. (1)[figure: benzene ring with one OH]
  2. (2)[figure: benzene ring with two OH groups on adjacent ring carbons]
  3. (3)[figure: benzene ring with two OH groups on ring carbons separated by one carbon (meta-type positions as drawn)]
  4. (4)[figure: benzene ring with OH on one carbon and CH3\mathrm{CH_3} on the carbon directly opposite]Official answer

Official answer

Option 4

NTA final key.

Chapter
Alcohols, Phenols and Ethers
Topic
Alcohols and Phenols
Idea tested
Phthalein Dye Test

Same idea in other shifts

Asked 4× in all
  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

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.