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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceSingle correctHardMulti-step

JEE Main 13 April 2023, Shift 1, Chemistry Q76

Question 76 of 90 in this shift, Chemistry question 16 of 30, Section A.

[figure: cyclobutyl ring attached to a carbon bearing OH, which is attached to a cyclopentyl ring] →ΔH+\xrightarrow[\Delta]{H^+} major product In the above reaction, left hand side and right hand side rings are named as 'A' and 'B' respectively. They undergo ring expansion. The correct statement for this process is:

The figure, in words

Reactant: a secondary alcohol carbon (CH-OH) flanked by a cyclobutane ring (left, 'A') and a cyclopentane ring (right, 'B'); reagent H+ / heat; major product asked.
  1. (1)Finally both rings will become six membered each.Official answer
  2. (2)Finally both rings will become five membered each.
  3. (3)Ring expansion can go upto seven membered rings
  4. (4)Only A will become 6 membered.

Official answer

Option 1

NTA final key.

Chapter
Alcohols, Phenols and Ethers
Topic
Alcohols and Phenols
Idea tested
Acid-Catalyzed Hydration Rearrangements

Same topic in other shifts

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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.