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Saturday, 31 October

JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumApplication

JEE Main 28 June 2022, Shift 2, Chemistry Q89

Question 89 of 90 in this shift, Chemistry question 29 of 30, Section B.

The major product of the following reaction contains __________ bromine atom(s). [reaction: structure →hνBr2\xrightarrow[h\nu]{\mathrm{Br_2}} Major Product]

The figure, in words

Benzofuran bicyclic (benzene fused to a furan ring with ring O at the bottom right; furan C=C drawn at the right). A substituent on the benzene carbon next to the fusion carbon: a carbon double-bonded to CH2 and also bonded to a two-carbon (ethyl) chain. Arrow with Br2 above and hv below, giving Major Product.

Official answer

1

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
Alkenes and Alkynes
Idea tested
Allylic Halogenation with NBS

Same idea in other shifts

Asked 3× in all
  1. 29 Jan 2024, Shift 1 · Q74Identify product A and product B :MediumDiagram basedHas a figure
  2. 16 Mar 2021, Shift 2 · Q44[figure: cyclohexene reacts with reagent A to give 1,4-dichlorocyclohex-2-ene (a cyclohexene ring with Cl on the two ring carbons para to…MediumDiagram 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.