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An '''aromatic ring''' is a [[hydrocarbon]], such as [[benzene]], that has a low [[hydrogen]] to [[carbon]] ratio. As in the case of benzene (formula C<sub>6</sub>H<sub>6</sub>), the carbon atoms form a hexagonal ring, with each carbon atom bonded in series at each point of the hexagon. Because of [[double bond|double bonding]], each carbon atom can bond to only one hydrogen. There are other shapes as well, including cyclooctatetraene, an octagonal aromatic ring.
An '''aromatic ring''' is a [[hydrocarbon]], such as [[benzene]], that has a low [[hydrogen]] to [[carbon]] ratio. As in the case of benzene (formula C<sub>6</sub>H<sub>6</sub>), the carbon atoms form a hexagonal ring, with each carbon atom bonded in series at each point of the hexagon. Because of [[double bond|double bonding]], each carbon atom can bond to only one hydrogen. There are other shapes as well, including cyclooctatetraene, an octagonal aromatic ring, where the same ratio applies.
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.
[[Category:Organic Chemistry]]
[[Category:Organic Chemistry]]