Can I determine aromaticity by Hückel's rule?
Yes, you can use Hückel's rule to determine aromaticity.
Hückel's rule says that a planar, conjugated, cyclic molecule is aromatic if it has 4
The most common aromatic molecule is benzene (
Azulene is aromatic (
-annulene is aromatic (
So is -annulene (
Many organic ions are aromatic. These include the cyclopropenyl cation (
the cyclopentadienide anion (
and the tropylium ion (