Chemistry - GOC Question with Solution | TestHub

(I) the cyclooctatetraene dication has 6π (three $\mathrm{C}=\mathrm{C}$ bonds, two empty p orbitals) : aromatic. (II) the cyclopropenyl anion has 4π : anti-aromatic. (III) the cyclobutenyl cation has an $\mathrm{s}{\mathrm{p}}^3$ carbon : non-aromatic. (IV) the cycloheptatrienyl anion has 8π : anti-aromatic. Only (I).