Which among the following is an allylic halide?

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An allylic halide is a compound in which the halogen atom is bonded to an $s p^{3}$ hybridized carbon atom that is adjacent to a carbon-carbon double bond ( $C = C$ ).

In 1-bromopropene ( $C H_{3} - C H = C H - B r$ ) and 2-bromopropene ( $C H_{3} - C (B r) = C H_{2}$ ), the bromine atom is attached to an $s p^{2}$ hybridized carbon atom, making them vinylic halides.

In 4-bromobut-1-ene ( $C H_{2} = C H - C H_{2} - C H_{2} - B r$ ), the bromine atom is attached to an $s p^{3}$ hybridized carbon atom, but it is not adjacent to the double bond.

In 3-bromopropene ( $C H_{2} = C H - C H_{2} - B r$ ), the bromine atom is attached to an $s p^{3}$ hybridized carbon atom which is directly adjacent to the carbon-carbon double bond. Thus, it is an allylic halide.

Answer: 3-Bromopropene

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