Catalytic hydrogenation of alkenes exhibits:
Correct answer: C. Addition reaction
- A. Substitution reaction
- B. Elimination reaction
- C. Addition reaction
- D. Condensation reaction
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.
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About Alkenes
Alkenes are unsaturated hydrocarbons containing a carbon-carbon double bond with sigma and pi components and restricted rotation. Their reactions include electrophilic addition of hydrogen, halogens, hydrogen halides and water, with Markovnikov orientation, oxidation, combustion and polymerisation, while their preparation commonly involves elimination from alkyl halides or alcohols.
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