Chemistry - GOC Question with Solution | TestHub

The positive charge can sit on the central carbon, or on the ortho (2) or para (1) carbons of either ring : 3 + 3 = 6 ring positions.

Central ${\mathrm{C}}^{+}$ : 2 x 2 Kekule forms = 4. Each ring-cation form has the other ring in 2 Kekule forms and its own ring in 1 quinoid form : 6 x 2 = 12.

Total = 4 + 12 = 16.