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There are variations to the benzene molecule. One such variation is [[toluene]] (formula C<sub>7</sub>H<sub>8</sub>, also called methylbenzene) where a [[methyl]] group replaces a hydrogen atom.
There are variations to the benzene molecule. One such variation is [[toluene]] (formula C<sub>7</sub>H<sub>8</sub>, also called methylbenzene) where a [[methyl]] group replaces a hydrogen atom.
Aromatic rings can also form in groups or chains, where each ring is "joined at the hip." These are called ''polycyclic benzenoid aromatic hydrocarbons''. One such case is naphthalene (formula C<sub>10</sub>H<sub>8</sub>), where two benzene rings share one carbon bond.
Aromatic rings were called ''aromatic'' in the early days of their discovery because they are [[fragrant]], as they were obtained from resins or oils.
[[Category:Organic Chemistry]]
[[Category:Organic Chemistry]]