Heat of hydrogenation used as a measure of stability of carbon-carbon double bonds when looking at two different alkenes that can be hydrogenated to saturated alkane(s).
The standard enthalpy of catalytic hydrogenation of an alkene is known as the heat of hydrogenation. An alkene can only be catalytically hydrogenated exothermically. As a result, the heat of alkene hydrogenation is always negative.
The stability of carbon-carbon double bonds is gauged by the heat of hydrogenation of alkenes. The more stable the double bond in an alkene is, assuming all other factors are equal, the less the numerical value of the heat of hydrogenation of the alkene. The trend in the stability of carbon-carbon double bonds is tetrasubstituted > trisubstituted > disubstituted > monosubstituted > unsubstituted, according to temperatures of hydrogenation of alkenes.
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