Vinyl Chloride has Cl directly attached to a C=C double bond, matching III: CH₂=CHCl.
Benzyl Chloride has CH₂Cl attached to a benzene ring, matching IV (benzene with CH₂Cl substituent).
Alkyl Chloride is a general chlorine-substituted alkane, matching II: CH₂-CH(Cl)CH₃ (a standard secondary alkyl chloride).
Allyl Chloride has CH₂Cl attached to the allylic position (adjacent to C=C), matching I: CH₂=CH-CH₂Cl.
The correct matching is A-III, B-IV, C-II, D-I.
