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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedEasyRecall

JEE Main 25 June 2022, Shift 1, Chemistry Q77

Question 77 of 90 in this shift, Chemistry question 17 of 30, Section A.

In the following reaction : [figure: benzene ring bearing a CH carbon with H3C\mathrm{H_3C} and CH3\mathrm{CH_3} on it, + O2→+\ \mathrm{O_2}\rightarrow benzene ring bearing a C carbon with H3C\mathrm{H_3C}, CH3\mathrm{CH_3} and −O−O−H\mathrm{-O-O-H}, then arrow labelled H+\mathrm{H^+} over H2O\mathrm{H_2O}, to A and B] The compounds A and B respectively are :

The figure, in words

Reaction scheme: a benzene ring carrying a CH(CH3)2 group + O2 gives a benzene ring carrying C(CH3)2-O-O-H, then H+ / H2O gives A and B. Options are benzene-ring drawings with the formula printed beside each.
  1. (1)[figure: benzene ring with CH3\mathrm{CH_3} substituent], CH3COOH\mathrm{CH_3COOH}
  2. (2)[figure: benzene ring with OH at top and a second OH drawn at a lower ring carbon, to the lower right of the ring], CH3COCH3\mathrm{CH_3COCH_3}
  3. (3)[figure: benzene ring with OH substituent], CH3COCH3\mathrm{CH_3COCH_3}Official answer
  4. (4)[figure: benzene ring with OH at top and a second OH drawn at the ring carbon next to it, to its right], CH3COCH3\mathrm{CH_3COCH_3}

Official answer

Option 3

NTA final key.

Chapter
Alcohols, Phenols and Ethers
Topic
Alcohols and Phenols
Idea tested
Cumene Hydroperoxide Synthesis

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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.