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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceOtherMediumMulti-step

JEE Main 4 August 2021, Shift 2, Chemistry Q43

Question 43 of 90 in this shift, Chemistry question 13 of 30, Section A.

Neopentyl bromide on reaction with ethyl alcohol gives, as the major product,

The figure, in words

Each option is a drawn structure printed with condensed labels: (1) CH3 and CH3 bonded to a C that is double-bonded (C = C) to a C bearing H and CH3; (2) CH3 - C - CH2CH3 with the central C double-bonded (||) to CH2 below; (3) CH3-C-CH2-CH2-C-CH3 with CH3 above and below each of the two C atoms (vertical bonds); (4) CH2 = CH - C = CH2 with CH3 below the third carbon (vertical bond).
  1. (1)[structure drawn: CH3\mathrm{CH_3} and CH3\mathrm{CH_3} on the left carbon, double bond to a right carbon bearing H and CH3\mathrm{CH_3}]Official answer
  2. (2)[structure printed: CH3−C−CH2CH3\mathrm{CH_3-C-CH_2CH_3} with the central C double-bonded to CH2\mathrm{CH_2} drawn below it]
  3. (3)[structure printed: CH3−C(CH3)(CH3)−CH2−CH2−C(CH3)(CH3)−CH3\mathrm{CH_3-C(CH_3)(CH_3)-CH_2-CH_2-C(CH_3)(CH_3)-CH_3} drawn with one CH3\mathrm{CH_3} above and one below each of the two C atoms]
  4. (4)[structure printed: CH2=CH−C=CH2\mathrm{CH_2=CH-C=CH_2} with CH3\mathrm{CH_3} drawn below the third C]

Official answer

Option 1

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
SN1 and SN2 Mechanisms
Idea tested
Neopentyl Halide Exceptions

Same topic in other shifts

All SN1 and SN2 Mechanisms questions
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  2. 2 Apr 2026, Shift 2 · Q65Correct statements regarding alkyl halides (R - X) among the following are: A. Alcohol being less polar solvent as compared to water,…MediumSingle correct
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  4. 8 Apr 2026, Shift 2 · Q63The major product of which of the following reaction is not obtained by rearrangement reaction ?MediumDiagram basedHas a figure
  5. 2 Apr 2025, Shift 2 · Q67Match List - I with List - II. List - I (Reaction) (A)…EasyMatch the listHas a figure
  6. 4 Apr 2024, Shift 2 · Q76Find out the major product formed from the following reaction. [Me : −CH3-\mathrm{CH_3}] →Me2NH (2 equiv)\xrightarrow{\mathrm{Me_2NH\ (2\ equiv)}}HardDiagram basedHas 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.