ALLYLIC HALIDES -
These are the compounds where the halogen group is attached to a sp3 hybridised carbon atom next to the carbon which is already in a double bond with another carbon atom.
In both SN1and SN2 mechanisms, these halides are reactive.
Some common examples are 1-chlorobut-2-ene (CH3-CH=CH-CH2-Cl), 1-bromohex-2-ene (CH3-CH2-CH2-CH=CH-CH2-Br), etc.
Therefore, 1-chlorobut-2-ene (CH3-CH=CH-CH2-Cl) is an example of allylic halides.
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