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. 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

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