Which one of the following is not an allylic halide?

Options

A. 4-bromopent-2-ene
B. 3-bromo-2-methylbut-1-ene
C. 1-bromobut-2-ene
D. 4-bromobut-1-ene

Answer

D

Explanation

An allylic halide is an alkyl halide in whose molecules there are one or more halogen atoms are present at allylic carbon. (Allylic carbon is a carbon atom bonded a carbon atom that in turn is doubly bonded to another carbon atom).
(a) `underset("4-bromopent-2-ene")(CH_3 - underset(underset(Br)(|))CH= CH - CH_3)`
(b) `underset("3-bromo-2-methylbut-1-ene")(CH_3 - overset(overset(Br) (|)) (CH) - overset(overset(CH_3) (|))C = CH_2)`
(c) `underset("1-bromobut-2-ene")(CH_3 - CH = CH 0 overset(overset(Br)(|))(CH_2))`
(d) `underset("4-bromobut-1-ene")(""overset(overset(Br)(|))CH_2 - CH_2 - CH = CH_2) `
(e) `underset("3-bromo-2-methyl propene")(""underset(underset(Br)(|))CH_2 - underset(underset(CH_3)(|)) C = CH_2)`