Which one is not an allylic halide?

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Question

(B) An allylic halide is a compound in which the halogen atom is bonded to an $sp^3$ hybridized carbon atom next to a carbon-carbon double bond $(C=C)

Vedclass · Accepted Answer

$1-$chlorobut$-1-$ene

Vedclass · Answer

(B) An allylic halide is a compound in which the halogen atom is bonded to an $sp^3$ hybridized carbon atom next to a carbon-carbon double bond $(C=C)$.$A$: $3-$chlorocyclohexa$-1-$ene has the chlorine on a carbon adjacent to the double bond (Allylic).$B$: $1-$chlorobut$-1-$ene has the chlorine directly attached to one of the carbons of the double bond ($sp^2$ hybridized),which is a vinylic halide,not allylic.$C$: $1-$chlorobut$-2-$ene is not allylic; however,the question asks for the non-allylic structure. Checking $1-$chlorobut$-2-$ene $(CH_3-CH=CH-CH_2Cl)$,the $Cl$ is on an $sp^3$ carbon,but it is not adjacent to the double bond in the standard allylic sense $(C=C-C-X)$. Wait,$1-$chlorobut$-2-$ene is actually a primary alkyl halide,not allylic.$D$: $3-$chloroprop$-1-$ene $(CH_2=CH-CH_2Cl)$ is the classic allylic halide.Comparing the options,$1-$chlorobut$-1-$ene is a vinylic halide,and $1-$chlorobut$-2-$ene is a primary alkyl halide. Given the standard classification,$1-$chlorobut$-1-$ene is the most distinct non-allylic example provided.

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