Question

Do aromatic hydrocarbons have at least one planar ring with delocalized p electrons?

Answer 1

No, but aromatic hydrocarbons have at least one planar ring with delocalized π electrons.

Explanation:

There are no atomic `p` orbitals because they have been combined to make molecular π orbitals.

The π orbitals must also contain `4n+2` electrons (the Hückel rule).

The best known aromatic hydrocarbon is benzene.

Below are the structures of aromatic hydrocarbons containing more than one ring.