Aromaticity Chemistry Of Aromatic Compounds

Aromatic compounds are characterized by a conjugated system of -electrons that follows Huckel’s rule: the number of -electrons should be , where is a non-negative integer.
Among the given options:
- Benzene ( ) has 6 -electrons, which satisfies Huckel’s rule ( , giving ). Hence, benzene is aromatic.
- Cyclohexene has a non-conjugated -system and is not aromatic.
- Cycloheptatriene is antiaromatic due to its 6 -electrons (it has a structure).
- Cyclooctatetraene is also antiaromatic due to its 8 -electrons (following ).
Thus, the molecule that shows aromatic character is benzene.