Chemistry - GOC Question with Solution | TestHub

The exocyclic ${\mathrm{C}}^{+}$ is secondary : 2 Kekule forms = 2.

The ring carbons that carry + (C-2, C-4 and C-6) each have two ring neighbours, so they are secondary : 3 more. The carbon bearing $\mathrm{C}{\mathrm{H}}_3$ (C-3) never carries the +.

Total = 2 + 3 = 5.