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The ring systems having the following characteristics are aromatic.
(i) Planar ring containing conjugated $\pi$ bonds.
(ii) Complete delocalization of the $\pi$ −electrons in the ring system i.e. each atom in the ring has unhybridized 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/nonaromatic.

Answers (1)

1		It is aromatic since the ring is planar, has complete delocalization of $\pi$ electrons, also 6 $\pi$ -electrons is there.
2		It is non-aromatic because the ring is non-planar, and has incomplete delocalisation of $\pi$ electrons, 6 $\pi$ electrons is present there.
3		It is aromatic since the ring is planar, has complete delocalization of $\pi$ electrons, also 6 $\pi$ -electrons are there.
4		It is non-aromatic because the ring is non-planar, and has incomplete delocalization of $\pi$ electrons, 4 $\pi$ electrons are present there.
5		It is aromatic since the ring is planar, has complete delocalisation of $\pi$ electrons. Juckel rule is obeyed here
6		It is aromatic since the ring is planar, and has complete delocalization of $\pi$ electrons. Huckel rule is obeyed here
7		It is non-aromatic because the ring is planar, has incomplete delocalization of $\pi$ electrons, 8 $\pi$ electrons is present there

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