Reason behind more Reactivity of Unsaturated Hydrocarbons My textbook says that unsaturated hydrocarbons are more reactive than saturated ones. But double and triple bonds are stronger than single bonds.
What is the explanation for this?
The unsaturated regions are electron-rich and typically allow for electrophilic attack, such as by halogens or protons. Saturated hydrocarbons usually react only with radicals (radical halogenation). C-H activation is often hard in saturated hydrocarbons.

While double and triple bonds are stronger than a single bond when looking at complete cleavage of a bond, one notices that the bond strength of a double bond is less than twice the bond strength of a single bond (with other factors being comparable, there are surely some exceptions). When a double bond reacts, it typically is changed into a single bond, not fully cleaved. Similar arguments hold for triple bonds.