MCQ
Which of the following is allylic halide?
- A$(1-$Bromoethyl$)$ benzene
- BBenzyl chloride
- C$1-$Bromo benzene
- ✓$3-$Chloro cyclohex$-1-$ene
✓
Answer
Correct option: D.
$3-$Chloro cyclohex$-1-$ene
Allylic halides are the halides in which the halogen atom is bonded to $sp^3−$ hybridized carbon atom next to carbon$-$carbon double bond $(C=C).$
General chemical structure of allylic halides:
$\ce{CH_2=CH−CH_2−X}$
Here$, X$ is any halogen atom.
So, according to the rule, only in $3-$chloro cyclohex$-1-$ene halide $(Cl)$ is attached with $sp^3$ carbon which is next to carbon$-$carbon double bond.
General chemical structure of allylic halides:
$\ce{CH_2=CH−CH_2−X}$
Here$, X$ is any halogen atom.
So, according to the rule, only in $3-$chloro cyclohex$-1-$ene halide $(Cl)$ is attached with $sp^3$ carbon which is next to carbon$-$carbon double bond.
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