Chlorotoluene is a group of three isomeric chemical compounds. They (ortho-chlorotoluene, meta-chlorotoluene, and para-chlorotoluene) consist of a disubstituted benzene ring with one chlorine atom and one methyl group. Chlorotoluene is a group of three isomeric chemical compounds. They (ortho-chlorotoluene, meta-chlorotoluene, and para-chlorotoluene) consist of a disubstituted benzene ring with one chlorine atom and one methyl group.