Benzene is an aromatic hydrocarbon with molecular formula C₆H₆. It is a planar cyclic molecule containing six carbon atoms arranged in a hexagonal ring with delocalized π-electrons.
Benzene exhibits resonance, and its structure is best represented by resonance hybrids rather than alternating single and double bonds. All C–C bond lengths are equal due to electron delocalization.
Aromaticity refers to the unusual stability of cyclic, planar, conjugated systems containing (4n + 2) π-electrons, as per Huckel’s rule.
A compound is aromatic if it:
Benzene undergoes electrophilic substitution reactions instead of addition reactions to preserve aromatic stability.
Substituents on benzene ring influence reactivity and orientation. Electron-donating groups activate the ring, while electron-withdrawing groups deactivate it.
Many pharmaceutical compounds contain aromatic rings. Understanding aromaticity is essential for predicting chemical reactivity and drug design.