Cyclopentene is a colorless, flammable liquid hydrocarbon with the chemical formula C5H8. It belongs to the class of compounds known as alkenes, characterized by the presence of a carbon-carbon double bond. Cyclopentene has a five-membered ring structure, making it a cyclic compound. It is commonly used in organic synthesis and as a building block for various chemical reactions. This compound is produced through the catalytic hydrogenation of cyclopentadiene or by the thermal cracking of petroleum. Cyclopentene is also utilized in the production of polymers and other chemical intermediates. Its unique structure allows for various applications in the chemical industry.