Hydrocarbons can be divided into saturated, unsaturated and aromatic hydrocarbons. Saturated hydrocarbons contain only single bonds. They are called alkanes. Unsaturated hydrocarbons contain double bounds (alkenes) or triple bounds (alkynes).
Although they are highly flammable, HCs may offer advantages as ODS substitutes because they are inexpensive to produce and they have zero ozone depletion potential, very low global warming potential (GWP), and low toxicity.