Question

Among the following halides, how many number categories in the allylic compound:
$3$-Chloropropene,$3$-Bromocyclohexene,Benzylchloride,$4$-Iodopent-$2$-ene,Bromobenzene,$1$-Chloroethylbenzene,$4$-Chlorocyclopentene, $1$-Chlorobut-$1$-ene,$1$-Chlorobut-$2$-ene.

Answer 1

Answer: 4

In allylic halides, the halogen atom is bonded to a $s{p}^3$ hybridised $C$-atom next to carbon-carbon double bond.
$3$ - Chloropropene, $3$ - Bromocyclohexene, $4$ -Iodopent-$2$-ene, $1-$ Chlorobut $-2-$ ene.