Unsaturated carbon compounds are more reactive than saturated carbon compounds.

Unsaturated hydrocarbons are more reactive due to the presence of $\mathrm{C}=\mathrm{C}$ and $\mathrm{C}\equiv \mathrm{C}$ bonds that are more electron-rich than single-bond saturated hydrocarbons. These double and triple bonds act as reactive sites in the unsaturated hydrocarbon compounds which readily give addition reactions.