Why alkenes undergo addition reaction?

Alkenes undergo addition reactions due to the presence of a carbon-carbon double bond (C=C), which is a region of high electron density. This double bond can easily react with electrophiles, allowing new atoms or groups to be added across the double bond. The reaction typically results in the conversion of the double bond into a single bond, forming saturated compounds. This reactivity is a key feature of alkenes, facilitating various synthetic pathways in organic chemistry.