Allylic halides are compounds containing halogen atoms bonded to sp3 hybridised C-atom next to carbon-carbon double bond. Vinylic halides are compounds containing halogen atom bonded to sp2 hybridised C-atom of an aliphatic compound. Benzylic halides are compounds containing halogen atoms bonded to sp3 hybridised C-atom next to benzene ring. In Aryl halides, the halogen atom directly attached to the aromatic ring.
