alkenes

https://doi.org/10.1351/goldbook.A00224
Acyclic branched or unbranched hydrocarbons having one carbon–carbon double bond and the general formula CnH2n . Acyclic branched or unbranched hydrocarbons having more than one double bond are alkadienes, alkatrienes, etc.
See also: olefins
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1313 (https://doi.org/10.1351/pac199567081307)