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Hydrocarbons are made up of only carbon and hydrogen. There are four types of hydrocarbon: Alkanes, alkenes, alkynes, and arenes.

Alkanes: Alkanes are organic compounds that consist entirely of single-bonded carbon and hydrogen atoms and lack of any functional group. They are also referred to as saturated hydrocarbon.

Alkenes: An alkene is an unsaturated hydrocarbon that consists of at least one carbon-carbon double bond.

Alkynes: An alkyne is an unsaturated hydrocarbon containing at least one carbon-carbon triple bond.

Arenes: Arenes are aromatic hydrocarbons (most commonly based on benzene rings) such as benzene and methylbenzene.