How many mononitrated (on the aromatic ring)derivatives of meta-xylene (= 1,3-dimethylbenzene)are possible? (Don't worry about how they might be made or which would be the major product.)

Question

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Meta-xylene has two methyl groups located at the 1 and 3 positions on a benzene ring. Nitration can occur at the 2, 4, or 6 positions relative to one of the methyl groups, but because of the symmetry of the molecule, nitration at the 2 or 6 positions relative to one methyl group is equivalent to nitration at the 2 or 6 positions relative to the other methyl group. Therefore, there are three unique positions where nitration can occur, leading to three possible mononitrated derivatives.

How Many Mononitrated (On the Aromatic Ring)derivatives of Meta-Xylene (=