Classify the compounds containing $sp^2 C - X$ bond.

Compounds in which the halogen atom is bonded to an $sp^2$ hybridized carbon atom are classified into two types:
$(a)$ Vinylic halides $(C=C-X)$: These are compounds in which the halogen atom is bonded to a carbon atom of a carbon-carbon double bond (an $sp^2$ hybridized carbon).
Example: $CH_2=CHCl$
$(b)$ Aryl halides $(ArX)$: These are compounds in which the halogen atom is bonded directly to a carbon atom of an aromatic ring (an $sp^2$ hybridized carbon).
Example: $C_6H_5X$ (Halobenzene)