Three-carbon molecule

Three-carbon molecules are based on a skeleton made from three carbon atoms. They may be in a chain, or cycles. C3 hydrocarbons are usually gases, they are inflammable, and may be harmful to humans and the environment.^[1] The CAS registry number for three-carbon hydrocarbons is 68606-26-8. Hydrocarbons that include three atoms are:

• Propane C₃H₈
• Propene C₃H₆
• Cyclopropane C₃H₆
• propyne C₃H₄
• Cyclopropene C₃H₄
• Propadiene C₃H₄
• Cyclopropenylidene C₃H₂
• Cyclopropyne C₃H₂
• Tricarbon C₃