Lexikon
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alkenes
hydrocarbons (branched or not) that contain carbon-carbon double bonds (called also olefins), e.g. ethylene H2C=CH2. The chemical name indicates the number of carbon atoms and ends with the suffix -ene, e.g. hexadecene (C16H34) contains 16 carbon atoms and one double bond, butadiene (C4H4) contains 4 carbon atoms and two double bonds.