The ring systems having following characteristics are aromatic.
(i) Planar ring containing conjugated \pi bonds.
(ii) Complete delocalisation of the \pi−electrons in 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 delocalisation of \pi electrons, also 6\pi-electrons is there.

2

It is non-aromatic because the ring is non-planar, has incomplete delocalisation of \pi electrons, 6\pi electrons is present there.

3

It is aromatic since the ring is planar, has complete delocalisation of \pi electrons, also 6\pi-electrons is there.

 

4

It is non-aromatic because the ring is non-planar, has incomplete delocalisation of \pi electrons, 4\pi electrons is 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, has complete delocalisation of \pi electrons. Huckel rule is obeyed here

7

It is non-aromatic because the ring is planar, has incomplete delocalisation of \pi electrons, 8\pi electrons is present there

 

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