Among the following, the number of aromatic compound (s) is/are

Step-by-step solution

Cyclooctatetraene; non-aromatic , due to non-planarity of ring the π -electrons are not delocalised. Cyclopropenyl anion; Anti-aromatic , 4 π -electrons are delocalised Cyclopropenyl cation; Aromatic, 2 π -electrons are delocalised. Cyclohexadiene : Non-aromatic, as π electrons are not fully conjugated. Tropylium ion : Aromatic , as it contains conjugated system of ( 4 n + 2 ) π electrons ( 6 π electrons). It is cyclic and planar. Cyclopentadienyl cation; Anti-aromatic, 4 π -electrons are delocalised. Cyclopentadie