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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 29 July 2022, Shift 2, Chemistry Q74

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

Compound ‘A’ undergoes following sequence of reactions to give compound ‘B’. The correct structure and chirality of compound ‘B’ is [where Et is −C2H5\mathrm{-C_2H_5}] [figure: Compound 'A' skeletal alkyl bromide drawn with a bold central bond and a Br substituent] →(ii) D2O(i) Mg, Et2O\xrightarrow[\text{(ii) } \mathrm{D_2O}]{\text{(i) Mg, } \mathrm{Et_2O}} B

The figure, in words

Compound 'A' is a skeletal drawing of an alkyl bromide (Br on a carbon at the lower right) shown under the arrow reaction (i) Mg, Et2O (ii) D2O giving B. Options A-D are skeletal structures each labelled Achiral or Chiral.
  1. (1)[figure: same skeleton as compound A with Br replaced by D, Achiral]
  2. (2)[figure: same skeleton as compound A with Br replaced by OD, Chiral]
  3. (3)[figure: same skeleton as compound A with Br replaced by D, Chiral]Official answer
  4. (4)[figure: shorter skeleton chain ending in OD, Achiral]

Official answer

Option 3

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
Alkanes and Free Radicals
Idea tested
Hydrolysis of Grignard Reagents

Same idea in other shifts

Asked 2× in all
  1. 5 Apr 2026, Shift 2 · Q72RMgI when treated with ice cold water liberated a gas which occupied 1.4 dm3^3/g at STP. The gas produced is further reacted with iodine…MediumNumerical value

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.