


Cyclopropenyl
cation Two pi electrons n = 0 
Benzene Six pi electrons n = 1 
Pyrrole Six pi electrons n = 1 

Furan Six pi electrons n = 1 

Pyridine Six pi electrons n = 1 

Imidazole Six pi electrons n = 1 

Naphthalene Ten pi electrons n = 2 



Cyclobutadiene Four pi electrons 
Cyclopentadienyl
cation Four pi electrons 
Cyclooctatetraene Eight pi electrons 