Chemistry of alkenes. Electrophilic addition. Oxidation reactions, hydrogenation, and polymerization. Alkynes are not abundant in nature, although they are part of some drugs such as hypnotics. The reactivity is similar to alkenes. We will study the reactivity of conjugated systems and compared their stability with alkenes. Unlike alkynes, conjugated systems are more widespread in nature, so you can see some examples such as lycopene or carotene whose color is associated with these systems. Diels-Alder reaction, thus introducing pericyclic reactions.