The given compound after reacting with NBS undergoes radical reaction.
In this radical reaction .Free radical is formed at benzyllic or allylic positions prefrentially.
why?
Since these radicals are resonance stabilized.This resonance stabilization is shown in the figure.
After bromination ,next step is elimination.
Ths gives an alkene.
This alkene has also carbonyl functional group.
This carbonyl functional group resonates to give a charged species.
This charged species is more stable,since this is resonance stablised.
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