However , hydrocarbons comprise a huge family of compounds , encompassing everything from methane (natural gas ) to such plastics as polyethylene , polypropylene , and polystyrene (Styrofoam (Lee Ray , 1991 . Just as the hydrocarbons in smog are not from Styrofoam , neither are they from trees they are , in fact , unburned gasoline vapors-compounds such as ethane and ethylene . Moreover , pinene reacts with ozone to form pinol , which combines with water to form a hydrate that has a melting point higher than the boiling point of...











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