What is formed when two alkenes undergo an addition reaction with hydrogen?

When two alkenes undergo an addition reaction with hydrogen, the product formed is alkanes. This reaction is known as hydrogenation, which involves the addition of hydrogen (H₂) across the double bond of the alkene, effectively converting it into a saturated alkane.

During this process, the π bond of the alkene is broken, and two new σ bonds are formed with hydrogen atoms. This results in a molecule with only single bonds, characteristic of alkanes, which follow the general formula CnH₂n+2.

Understanding the nature of alkenes and the hydrogenation reaction is crucial in organic chemistry, as it highlights the transition from an unsaturated to a saturated compound, thus illustrating the impact of unsaturation in the reactivity of organic molecules.