#hydrocarbon  an organic compound containing only carbon and hydrogen
  supertype:  organic_compound__organiccompound  any compound of carbon and another element or a radical
  subtype:  gasohol  a gasoline substitute consisting of 90% gasoline and 10% grain alcohol from corn
  subtype:  gasoline__gasolene__gas__petrol  a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines
     subtype:  leaded_gasoline  gasoline treated with a lead compound to reduce motor knocks; "combustion of leaded gasoline released lead into the air where it could cause lead poisoning"
     subtype:  napalm  gasoline jelled with aluminum soaps; highly incendiary liquid used in fire bombs and flame throwers
     subtype:  unleaded_gasoline  gasoline that has not been treated with a lead compound
  subtype:  kerosine__kerosene  a flammable hydrocarbon oil used as fuel in lamps and heaters
     subtype:  paraffin_oil__paraffin  British usage
  subtype:  benzene__benzine__benzol  a colorless liquid hydrocarbon; highly inflammable; carcinogenic
     subtype:  benzene_formula__benzeneformula__benzene_ring__benzenering__benzenenucleu__kekuleformula  a closed chain of 6 carbon atoms with hydrogen atoms attached
  subtype:  indene  a colorless liquid hydrocarbon extracted from petroleum or coal tar and used in making synthetic resins
  subtype:  dioxin  any of several toxic or carcinogenic hydrocarbons that occur as impurities in herbicides
  subtype:  ethane  a colorless odorless gas used as fuel
  subtype:  liquefied_petroleum_gas__bottled_gas  hydrocarbon gases, usually propane or butane, kept under pressure
  subtype:  bitumen  any of various naturally occurring impure mixtures of hydrocarbons
     subtype:  tar  any of various dark heavy viscid substances obtained as a residue
        subtype:  coal_tar  a tar formed from distillation of bituminous coal; coal tar can be further distilled to give various aromatic compounds
  subtype:  butadiene  a gaseous hydrocarbon C4H6; used in making synthetic rubbers
     subtype:  chloroprene  derivative of butadiene used in making neoprene by polymerization
  subtype:  naphtha  any of various volatile flammable liquid hydrocarbon mixtures; used chiefly as solvents
  subtype:  naphthalene  a white crystalline strong-smelling hydrocarbon made from coal tar or petroleum and used in organic synthesis and as a fumigant in mothballs
  subtype:  octane  any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent
  subtype:  gas_oil__gasoil  an oil formed through distillation of petroleum of intermediate boiling range and viscosity
  subtype:  terpene  an unsaturated hydrocarbon obtained from plants
     subtype:  limonene  a liquid terpene with a lemon odor; found in lemons and oranges and other essential oils
  subtype:  provitamin  vitamin precursor; a substance that is converted into a vitamin in animal tissues
     subtype:  provitamin_A__carotene__carotin  an orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver
        subtype:  beta-carotene  an isomer of carotene that is found in dark green and dark yellow fruits and vegetables

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