Pyridine, a six-membered aromatic ring containing one nitrogen atom, exhibits delocalized π-electrons forming a conjugated system.
$$ \text{Pyridine: } C_5H_5N $$
Pyridine's delocalized electrons adhere to Hückel’s rule. This rule dictates that a compound is aromatic if it possesses a planar, monocyclic structure and \( 4n + 2 \) π-electrons, where \( n \) is an integer. With 6 π-electrons, pyridine satisfies Hückel's rule for aromaticity.
$$ 6 \pi^e \text{ in delocalization follows Hückel's rule.} $$
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