2penten

2-pentene is an alkene with the chemical formula C5H10. It is a structural isomer of pentane, meaning it has the same molecular formula but a different arrangement of atoms. Specifically, 2-pentene features a double bond between the second and third carbon atoms in a five-carbon chain.

Due to the presence of the double bond, 2-pentene exhibits geometric isomerism. It exists as two stereoisomers: cis-2-pentene and trans-2-pentene. In cis-2-pentene, the hydrogen atoms attached to the carbons of the double bond are on the same side. In trans-2-pentene, these hydrogen atoms are on opposite sides. These isomers have different physical properties, such as boiling points and melting points.

2-pentene is a colorless liquid at room temperature and pressure. It is flammable and has a characteristic odor. Like other alkenes, it undergoes addition reactions across the double bond, such as hydrogenation to form pentane or halogenation. It can also be polymerized under certain conditions.

Industrially, 2-pentene can be obtained from the fractional distillation of petroleum or through cracking processes. It is not a widely produced chemical but can be used as a feedstock in organic synthesis or as a component in certain fuel mixtures. Its reactivity makes it a useful intermediate in the production of various chemicals.