Which compound is NOT an allylic halide (four alkenyl halides given as formulas)

1. A.
   CH₂=CH-CH₂-X
2. B.
   CH₃-CH=CH-CH₂-X
3. C.
   CH₃-CH₂-CH=CH-CH₂-X
4. D.
   CH₃-CH=CH-CH₂-CH₂-X

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1. A.
   ${CH}_{2} = CH - {CH}_{2} - X$
2. B.
   ${CH}_{3} - CH = CH - {CH}_{2} - X$
3. C.
   ${CH}_{3} - {CH}_{2} - CH = CH - {CH}_{2} - X$
4. D.
   ${CH}_{3} - CH = CH - {CH}_{2} - {CH}_{2} - X$

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