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Q.
Which of the following will exhibit aromatic character?
Hydrocarbons
Solution:
Since in azulene (IV) two rings share a double bond, therefore, two electrons of this double bond can be counted towards each. As a result, each ring has $6\,\pi$-electrons and hence azulene is aromatic. Pyrrole (II), is aromatic because it contains $6\pi$-electrons (four from the two double bonds + one lone pair of electrons on the $N$ atom).
