Butyne

Its chemical formula is CH3-CH2-C≡CH, where "≡" represents a triple bond between the two carbon atoms. Butyne is an alkyne, which is a type of hydrocarbon characterized by the presence of at least one carbon-carbon triple bond. In the case of butyne, the triple bond is located between the second and third carbon atoms of the four-carbon chain.

Butyne is a gas at room temperature and pressure. It is flammable and can be used as a fuel or as a starting material for the synthesis of other organic compounds.