Alkenes and Alkynes Alkene (or olefin) Hydrocarbon that contains a carbon-carbon double bond Present in most organic and biological molecules Alkyne Hydrocarbon that contains a carbon-carbon triple bond Rarely occur in biological molecules or pathwaysAlkenes and Alkynes Alkene (or olefin) ▪ Hydrocarbon that contains a carbon-carbon double bond ▪ Present in most organic and biological molecules Alkyne ▪ Hydrocarbon that contains a carbon-carbon triple bond ▪ Rarely occur in biological molecules or pathways