Chemistry - Nomenclature Question with Solution | TestHub

1,3,5-trimethylbenzene (mesitylene) has methyl groups at positions 1, 3, and 5. The remaining available positions on the benzene ring are 2, 4, and 6. Due to the molecule's high symmetry, these three positions are chemically equivalent. Therefore, a single nitro group ($-{\mathrm{NO}}_2$) can substitute at only one distinct position, yielding one unique mononitrated product.