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Definition of alkenes Alkenes are hydrocarbons that contain carbon carbon double bond (C=C). The general formula of alkenes are CnH2n in comparison to alkanes with general formula CnH2n+2. Alkanes are saturated with hydrogens, while alkenes are two hydrogen less than alkanes. Thus it is known as unsaturated hydrocarbons. For example: Nomenclature IUPAC system In IUPAC … Read more