Similarly, if halogen is attached
to secondary or tertiary carbon atom, the alkyl halide is called
secondary alkyl halide (2°) and tertiary (3°) alkyl halide, respectively (b) Allylic halides
These are the compounds in which the halogen atom is bonded to an
sp3-hybridised carbon atom adjacent to carbon-carbon double bond
(C=C) i e to an allylic carbon