Answer
The answer is attached below.
Work Step by Step
In a benzene ring, the numbering starts from the carbon at the top. The hydrogens are substituted to form substituted benzenes. 1-chloro-4-methylbenzene is a disubstituted benzene.
In 1-chloro-4-methylbenzene, Chlorine is substituted for hydrogen of carbon number 1 and methyl group for hydrogen of carbon number 4.