Question

Explain Huckel’s rule of aromaticity with suitable examples

Answer 1

In 1931, German chemist and physicist Erich Hückel proposed a theory to help determine if a planar ring molecule would have aromatic properties. His rule states that if a cyclic, planar molecule has 4n+2 π electrons, it is considered aromatic. This rule would come to be known as Hückel's Rule.

All aromatic compounds follow Hückel's rule.

Explanation:

Hückel's rule states that a planar, cyclic, conjugated molecule is aromatic if it contains 4

n

+ 2 π electrons, where

n

= 0 or any positive integer.

See Can I determine aromaticity by Hückel's rule?

Compounds with

n

= 1