Aliphatic and aromatic compounds
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In organic chemistry, hydrocarbons can be divided into aromatic compounds which contain aromatic rings, also known as benzene rings, and aliphatic compounds which do not.
Examples: - Methane is an aliphatic compound, and contains no aromatic rings. - Benzene is an aromatic compound, as it is an aromatic ring. - Toluene is an aromatic compound, as it contains an aromatic ring bonded to a methyl group.