Q51 · CSIR-NET Chemistry, June 2017
Paper: CSIR-NET June 2017 · Subject: Organic Chemistry · Chapter: Photochemical Reactions · Topic: Photocycloaddition · Marks: 2 · Difficulty: Medium
The major product formed in the following reaction is: 
(a)
(b)
(c)
(d)
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
NBS/hν brominates benzylic positions by a radical mechanism. With 2 equivalents, one Br goes on each benzylic CH₂ of acenaphthene, giving 1,2-dibromoacenaphthene (b).
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