Trans-2-butene is an organic compound classified as an alkene, which means it contains a carbon-carbon double bond. Its chemical formula is C4H8, and it has a linear structure with four carbon atoms. The "trans" designation indicates that the two methyl groups (–CH3) attached to the double bond are on opposite sides, giving it a specific geometric configuration. This compound is commonly used in the production of various chemicals and plastics. It can be found in small amounts in natural gas and is also produced during the refining of petroleum. Trans-2-butene is important in organic chemistry for studying reactions involving alkenes.