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← JEE Main 2022 · 28 Jun · Shift 2
ChemistryInteger+4 / -1Question 89 of 90

JEE Main 2022 · 28 Jun · Shift 2, Chemistry question 89

The major product of the following reaction contains ______ bromine atom(s).

Benzofuran carrying at C4 a but-1-en-2-yl group (C(=CH2)CH2CH3), treated with Br2 / hν to give the major product.
Answer and worked solution

Official answer: 1

Br₂/hν brings about free-radical substitution at the allylic CH2\mathrm{CH_2} of the side chain (the most stable radical), introducing one Br.

Answer: 1