Isopropyl chloride
Bromobenzene
Chloroethene
Chlorobenzene
Friedel-Crafts reaction is carried out by the generation of a carbocation. In chlorobenzene, bromobenzene, and chloroethene, the lone pair of electrons on the halogen atom is delocalized with the π bonds to attain double bond character. This delocalization makes the carbon-halogen bond less susceptible to cleavage, preventing the formation of the necessary carbocation intermediate. Therefore, only isopropyl chloride can be used as the halide component for a Friedel-Crafts reaction because it readily forms a carbocation. Hence, the correct option is Isopropyl chloride.