The statement is not true of alkenes as "they are more stable than alkanes."
“Alkenes are unsaturated hydrocarbons with at least one carbon-to-carbon double bond, with the formula CnH2n (example, containing only carbon and hydrogen). Olefins are a term used to designate alkenes. The C=C functional group is found in alkenes. Alkenes are unsaturated hydrocarbons which go through addition reactions. Alkenes are much less stable than alkanes, mostly because of the reactivity of the carbon–carbon pi-bond, they are much more reactive than alkanes.”
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