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Introduction To Organic Chemistry


Hydrogenation of Alkenes

Hydrogenation is the addition of hydrogen to alkenes. It should be noted that alkenes, due their carbon-carbon double bond functional group, do not undergo substution reactions like alkanes. As a result of hydrogenation, alkanes are produced. Hydrogenation includes the manufacture of margarine from animal or vegetable fats and oils.

Hydrogenation takes place in the presence of a nickel or platinum catalyst and a temperature of 2000C with a pressure between 0-5 atmospheres. Note the following reaction below and the nickel catalyst:

Ethene + Hydrogen Ethane