Question

Azulene is isomer of Napthalene. It has 2 fused rings. It has aromatic nature due to ___

• A. Fused ring of cyclopentadienyl anion is aromatic
• B. Fused ring of cyclohepentatrienyl cation is aromatic
• C. Fused ring of cyclopenta dienylanion is antiaromatic
• D. Both (a) and (b)

Answer 1

The correct option is D

Both (a) and (b)

Azulene (isomer of naphthalene) shows resonance and some of the resonating structures have a fused cyclopentadienyl anion and cycloheptatrienyl cation (both of which are aromatic in nature) due to which azulene accounts aromatic character.