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Saturday, 31 October

JEE Main 2026 · ChemistryMultiple choiceDiagram basedMediumMulti-step

JEE Main 4 April 2026, Shift 2, Chemistry Q64

Question 64 of 75 in this shift, Chemistry question 14 of 25, Section A.

Compound (X) is subjected to the sequence of reactions as shown above. Molar mass of the major product (Y) formed is ________ g mol−1\mathrm{g\ mol^{-1}}. (Given molar mass in g mol−1\mathrm{g\ mol^{-1}} C:12, H: 1, O: 16)

The figure, in words

Compound (X) is styrene (benzene ring bearing a vinyl group, CH=CH2). Reaction sequence: (i) Br2 / CHCl3, (ii) NaNH2 excess, (iii) CH3I, (iv) H2, Na/NH3 (l), giving the major product (Y).
  1. (1)90
  2. (2)118Official answer
  3. (3)160
  4. (4)125

Official answer

Option 2

NTA final key.

Chapter
Hydrocarbons
Topic
Alkenes and Alkynes
Idea tested
Stereoselective Alkyne Reduction

Same idea in other shifts

Asked 4× in all
  1. 6 Apr 2024, Shift 1 · Q88The major product of the following reaction is P. CH3C=C−CH3\mathrm{CH_3C = C - CH_3}…MediumNumerical valueHas a figure
  2. 1 Feb 2024, Shift 2 · Q75In the given reactions identify A and B H2+A→Pd/C\mathrm{H_2 + A \xrightarrow{Pd/C}} [figure: alkene with CH3\mathrm{CH_3} (upper left) and…EasyOtherHas a figure
  3. 4 Aug 2021, Shift 1 · Q43Select the most suitable reagent for the following reduction reactionEasySingle 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.