The IUPAC name of is

The given compound is a substituted benzene ring with three substituents: a chloro group ($-Cl$), a methyl group ($-CH_3$), and a nitro group ($-NO_2$).

According to IUPAC nomenclature rules, the carbon atoms of the benzene ring are numbered to give the lowest possible locant set to the substituents.

Evaluating the possible numbering schemes:
Starting from the chloro group and numbering towards the nitro group gives locants $1, 2, 4$.
Starting from the nitro group and numbering towards the chloro group gives locants $1, 2, 5$.
Starting from the methyl group and numbering towards the nitro group gives locants $1, 3, 4$.

The lowest locant set is $1, 2, 4$. Thus, the chloro group is at position $1$, the nitro group is at position $2$, and the methyl group is at position $4$.

The substituents are cited in alphabetical order: Chloro, Methyl, Nitro.

Combining these with the parent name benzene, the IUPAC name is $1$-Chloro-$4$-methyl-$2$-nitrobenzene.

Answer: 1-Chloro-4-methyl-2-nitrobenzene