Consider the molecules below State clearly if each is Aromat

Consider the molecules below: State clearly if each is Aromatic or Non aromatic. If not aromatic state the reason it is not.

Solution

a. Aromatic Hukel rule (4n+2) Pi

b. aromatic     (4n+2) Pi    n=0

                           2Pi

c. Cyclopentadinyl anion is cyclic planar. It is aromatic

d. It is not aromatic 8Pi electrons