The correct answer is: C. Chlorobenzene
The reaction of benzene and chlorine in the presence of a catalyst, such as iron, is called the Friedel-Crafts alkylation reaction. In this reaction, the benzene ring is alkylated, or substituted with an alkyl group. The alkyl group is a hydrocarbon group that is derived from an alkane by removing one hydrogen atom. In the case of chlorobenzene, the alkyl group is chloromethyl, which is derived from methane by removing one hydrogen atom.
The Friedel-Crafts alkylation reaction is a very important reaction in organic chemistry. It is used to synthesize a variety of compounds, including pharmaceuticals, pesticides, and plastics.
The other options are incorrect because they are not products of the Friedel-Crafts alkylation reaction. Benzene hexachloride is a chlorinated hydrocarbon that is used as a pesticide. Benzylchloride is a compound that is used to make benzyl alcohol and benzyl ether. Benzoyl chloride is a compound that is used to make benzoic acid and benzaldehyde.