Question

Give IUPAC names of the following compound:

Options

• 1-Chloro-2-methylbenzene

• 2-Chlorotoluene

• O-Chlorotoluene

• Both 1-chloro-2-methylbenzene and 2-chlorotoulene

Answer 1

Both 1-chloro-2-methylbenzene and 2-chlorotoulene

Explanation:

−Cl (chloro) is given priority over −CH₃ (methyl) group. So it is numbered as 1. So the IUPAC name is 1-chloro-2-methylbenzene. Also, toluene is an IUPAC accepted name for methylbenzene. Hence the given compound can be named 2-chlorotoluene also, in which case −Cl is numbered.