Which of the following will exhibit aromatic character?

I, III

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III, IV

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II, IV

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II, III

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Solution

The correct option is B II, IV

Since in azulene (IV)has 10 pie electrons obeys Huckel's rule.

As a result, each ring has $6 π$ - electrons and hence azulene is aromatic.

Pyrrole (II), is aromatic because it contains $6 π$ - electrons (four from the two double bonds + one lone pair of electrons on the N atom).

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