Which among the following is an allylic halide?

Step-by-step solution

An allylic halide contains a halogen attached to an sp^3 carbon adjacent to a carbon-carbon double bond. Examining the options: A) 1-Bromopropene ( CH₃-CH=CH-Br ): bromine is attached to an sp^2 carbon, making this vinylic. B) 2-Bromopropene ( CH₂=C(Br)CH₃ ): bromine is attached to an sp^2 carbon, also vinylic. C) 3-Bromopropene ( CH₂=CH-CH₂Br ): bromine is attached to an sp^3 carbon adjacent to the double bond, satisfying the allylic condition. D) 4-Bromobut-1-ene ( BrCH₂CH₂CH=CH₂ ): bromine is attached to an sp^3