This video is about the 3 major reactions in Alkenes. They are Hydrohalogenation, Hydrogenation, and Halogenation. Hydrohalogenation is a Hydrogen with a halogen element combing, the double bond goes away because of an addition reaction. Hydrogenation is just 2 Hydrogen atom in a reaction, the double bond goes away because of the addition reaction. Finally, halogenation reaction is just 2 halogen elements reacting and the double bond is going away because of the addition reaction.