Catalytic hydrogenation of alkenes exhibits:

Explanation

Catalytic hydrogenation of alkenes exhibits addition reactions. Addition reactions in an unsaturated compound mean a compound that has a double bond can undergo addition reactions. The addition reactions can be classified into three main categories. Electrophilic addition: In these types of reactions, a species, that accepts an electron pair, attacks the electron-rich site of the double bond between carbon atoms. The reaction examples include the reactions of alkenes with hydrogen halides to give alkyl halides. Nucleophilic addition: In these types of reactions, species that have electron pairs, donate to form a chemical bond. These reactions usually occur in compounds having a carbonyl group like aldehydes or ketones. Free-radical addition: In these types of reactions, non-polar molecules form bonds with unsaturated compounds. These reactions occur when free radicals are formed. Free radicals are species that have unpaired valence electrons.