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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceOtherMediumConceptual

JEE Main 26 June 2022, Shift 1, Chemistry Q74

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

(C7H5O2)2→hν[X]→2C˙6H5+2CO2(\mathrm{C_7H_5O_2})_2\xrightarrow{h\nu}[\mathrm{X}]\rightarrow2\dot{\mathrm{C}}_6\mathrm{H}_5+2\mathrm{CO_2} Consider the above reaction and identify the intermidiate 'X'

The figure, in words

Options A-D are drawn structures, each a C6H5 group attached to a C=O carbon; they differ only in the charge/dot marking (circled plus; O with circled minus; O with dots; O with dots and a radical dot).
  1. (1)[structure: C6H5 attached to a carbon that is double-bonded to O and carries a circled plus sign]
  2. (2)[structure: C6H5 attached to a carbon that is double-bonded to O and single-bonded to an O carrying a circled minus sign]
  3. (3)[structure: C6H5 attached to a carbon that is double-bonded to O and single-bonded to an O drawn with two pairs of dots (lone-pair dots) on it]
  4. (4)[structure: C6H5 attached to a carbon that is double-bonded to O and single-bonded to an O drawn with two pairs of dots and a single dot on its right]Official answer

Official answer

Option 4

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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.