The ring systems having following characteristics are aromatic.
(i) Planar ring containing conjugated `pi` bonds .
(ii) complete dolocalisation of the `pi` -electron in ring system i.e. , each atom in the ring has unbybridised p-orbital , and
(iii) Presence of `(4n+2)pi`-electrons in the ring where n is an integer(n = 0, 1, 2, .......) [Huckel rule]. Using this information classify the following compounds as aromatic/non-aromatic.

Explanation