What are the bond enthalpies and bond lengths between carbon and carbon atoms in alkanes and alkenes?

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$C-C$ Bond Type Bond Length Bond Enthalpy
$C-C$ (Single bond in alkane) $154 \ pm$ $348 \ kJ \ mol^{-1}$
$C=C$ (Double bond in alkene) $134 \ pm$ $615 \ kJ \ mol^{-1}$

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