Question

Why compounds that do not obey huckle rule are aromatic aromaticity in chemistry?

Answer 1

Furan too follows Huckel’s rule. We not only count ππ-electrons but we also count electrons of lone pair. In furan, one of the oxygen’s lone pairs is involved in resonance with the two ππ-bonds and hence, the total number of electrons involved in resonance becomes 6 which is equal to 4n+24n+2, where n=1 and hence, Huckel’s rule is followed.



So, we count number of electrons involved in resonance to check the Huckel’s rule and not only ππ-electrons.

Answer 2

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The property is common to all aromatic compounds and is referred to as aromaticity or aromatic character. The aromatic character of benzene is correlated to its structure, Aromaticity is due to extensive cyclic delocalization of p-electrons in planar ring structures