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# $CH_2 =CH CH_2CH =CH_2 \longrightarrow A,\;A$ is ?

$(a) \;CH_2=CHCHCH-Br =CH_2 \\ (b)\;CH_2 =CH CH =CHCH_2Br \\ (c)\;CH_2 =CH_2CH =CHBr \\ (d)\;none$

N- Bromosuccinimide is a specific reagent which facilitates the substitution of allylic and benzylic hydrogen by free redical mechanism.
Hence a is the correct answer.