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The ring systems having following characteristics are aromatic.

1. Planar ring containing conjugated $\pi$ bonds.
2. Complete delocalisation of the $\pi$−electrons in ring system i.e. each atom in the ring has unhybridised p-orbital, and
3. 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/ nonaromatic.