Cycloalkenes are a type of hydrocarbon that contain a ring structure with at least one carbon-carbon double bond. They are part of the broader category of alkenes, which are characterized by the presence of double bonds between carbon atoms. The simplest cycloalkene is cyclopropene, which has three carbon atoms and one double bond. These compounds can exhibit unique chemical properties due to their cyclic nature and the presence of double bonds. The general formula for cycloalkenes is CₙH₂ₙ₋₂, where n represents the number of carbon atoms in the ring. Cycloalkenes can undergo various chemical reactions, including addition reactions, where atoms or groups are added across the double bond. Their structure allows for different isomers, which can have varying physical and chemical properties, making them interesting for study in organic chemistry.