Question 18.8: Name the following compound....

Benzene derivatives are named using the general form (name of substituent) benzene. Because this derivative has two substituents, the substituents are numbered and listed alphabetically. The two substituents are bromo- and chloro-.

Because bromo- is first alphabetically, it is assigned the number 1; therefore chlorois assigned the number 2. Following the general form, the name of the compound is 1-bromo-2-chlorobenzene. Alternatively, this compound could be named as ortho-bromochlorobenzene.