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Saturday, 10 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctHardMulti-step

JEE Main 9 April 2024, Shift 1, Chemistry Q74

Question 74 of 90 in this shift, Chemistry question 14 of 30, Section A.

In the following sequence of reaction, the major products B and C respectively are : [figure: Cl-cyclobutane-Br (1,3-disubstituted cyclobutane) →Na/Et2O\xrightarrow{\mathrm{Na/Et_2O}} A; A →(ii) D2O(i) Mg/Et2O\xrightarrow[\mathrm{(ii)\ D_2O}]{\mathrm{(i)\ Mg/Et_2O}} B; A →CoF2\xrightarrow{\mathrm{CoF_2}} C]

The figure, in words

Scheme: Cl-substituted cyclobutane bearing Br (Cl-[cyclobutane]-Br) reacts with Na/Et2O to give A; A with (i) Mg/Et2O (ii) D2O gives B; A with CoF2 gives C. Options are structures.
  1. (1)[figure: D-cyclobutyl-cyclobutyl-D (bicyclobutyl with D at each end) and F-cyclobutyl-cyclobutyl-F]Official answer
  2. (2)[figure: bicyclo[1.1.0]butane and F-cyclobutane-F]
  3. (3)[figure: D-cyclobutane-D and F-cyclobutane-F]
  4. (4)[figure: D-bicyclo[1.1.0]butane-D and F-cyclobutyl-cyclobutyl-F]

Official answer

Option 1

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
Alkanes and Free Radicals
Idea tested
Wurtz Reaction Limitations

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 42 of the 174 JEE Main shifts held from 2017 to 2026.