Liquid hydrocarbons are organic compounds composed of hydrogen and carbon atoms. Two examples of liquid hydrocarbons are toluene and BENZENE. Toluene is a colorless, water-insoluble liquid with a sweet smell and a boiling point of 110.6 degrees Celsius. BENZENE is a colorless, flammable liquid with a sweet smell and a boiling point of 80.1 degrees Celsius. Both toluene and BENZENE are used in the production of gasoline, plastics, and other products.