The reactivity of alkenes is due to the presence of?

Explanation

The reactivity of an alkene is primarily due to the presence of a pi bond. This pi bond, formed by the overlapping of p orbitals, allows alkenes to undergo addition reactions and form new compounds. The characteristic reactivity of alkenes arises from the ability of the pi bond to interact with other molecules, leading to diverse chemical transformations. Therefore, the correct answer is Option C: One pi bond.While sigma bonds are essential for the structure of alkenes, they are not directly responsible for their reactivity. Two pi bonds are not typically found in alkenes, as they generally contain a single pi bond. Additionally, while alkenes can exhibit electrophilic behavior, it is the presence of pi bonds that primarily governs their reactivity.