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The existence of six p orbitals, each with a single unpaired electron, in a cyclic structure of six atoms satisfies which criterion for aromaticity?

1. The presence of six p orbitals.
2. Each orbital having one unpaired electron.
3. Being part of a six-membered cyclic arrangement.
4. Fulfilling Huckel's aromaticity rule.

Correct answer: Fulfilling Huckel's aromaticity rule.

Solution

Huckel's rule states that a cyclic, planar molecule is aromatic if it has (4n+2) π-electrons. The presence of 6 p orbitals with one unpaired electron each satisfies this rule, making option D correct.

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