Which of the following is an allylic halide?

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$C H_{2} = C H X$

$C_{6} H_{5} C l$

$C H_{3} C H_{2} X$

$C H_{2} = C H - C H_{2} X$

answer is B.

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Detailed Solution

Halides known as allylic halides are those in which a halogen atom is joined to a carbon atom that has undergone $s p^{3}$ hybridization next to a carbon-carbon double bond (C=C). Allylic halides have the following general chemical structure:

$C H_{2} = C H - C H_{2} - X$

X here can be any halogen atom.
Let's now sketch the composition of each compound to identify the allylic halide. - 3-bromo -2-methylpropene

- 3-bromobut-1-ene:

- 3-bromopent-2-ene

- 4-bromobut-1-ene

The structures of the aforementioned compounds show that bromine is joined to the $s p^{3}$ hybridised carbon atom, which is adjacent to the carbon-carbon double bond or $s p^{2}$ hybridised carbon, in 3-bromo-2-methylpropene and 3-bromobut-1-ene. Thus, the allylic halides 3-bromo-2-methylpropene and 3-bromobut-1-ene are both present.

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