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A hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. They are the simplest organic compounds, and the basis of all other organic molecules. Hydrocarbons are classified based on their structure. Aliphatic hydrocarbons are compounds that contain carbon atoms arranged in a straight chain or branched chain. Alicyclic hydrocarbons are compounds that contain carbon atoms arranged in a ring. Aromatic hydrocarbons are compounds that contain benzene rings.