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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 26 June 2022, Shift 2, Chemistry Q73

Question 73 of 90 in this shift, Chemistry question 13 of 30, Section A.

The major product in the following reaction [drawn skeletal structure with a double bond at the end of the chain] --(i) Hg(OAc)2\mathrm{Hg(OAc)_2}, H2O\mathrm{H_2O}; (ii) NaBH4\mathrm{NaBH_4}--> ? is

The figure, in words

Stem: a skeletal line drawing of an alkene with a reaction arrow labelled (i) Hg(OAc)2, H2O above and (ii) NaBH4 below, then '?'. Options A-D are skeletal line drawings (OH on a carbon; C=O; OH at bottom left; chain ending in OH at right).
  1. (1)[drawn skeletal structure with an OH group on a carbon]Official answer
  2. (2)[drawn skeletal structure with a C=O (O drawn at the bottom)]
  3. (3)[drawn skeletal structure with OH drawn at the bottom left]
  4. (4)[drawn skeletal structure with a longer chain ending in OH at the right]

Official answer

Option 1

NTA final key.

Chapter
Hydrocarbons
Topic
Alkenes and Alkynes
Idea tested
Oxymercuration-Demercuration

Same idea in other shifts

Asked 2× in all
  1. 28 Jul 2022, Shift 1 · Q73Choose the correct option for the following reactions. (CH3)3C−CH=CH2\mathrm{(CH_3)_3C-CH=CH_2} (3,3-dimethylbut-1-ene, drawn as…MediumSingle correctHas a figure

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.