Addition reactions are characteristic of unsaturated compounds (alkenes, alkynes, etc.). Hydrogenation specifically involves the addition of hydrogen. Catalysts (like Ni, Pt, or Pd) are typically used to speed up the reaction rate.
Hydrogenation of vegetable oils using nickel catalyst is an example of
Asked in UPSC NDA 1 2021 · Topic: Organic Chemistry (Aliphatic and Aromatic Hydrocarbons: Nomenclature, preparation, reactions of alkanes, alkenes, alkynes, benzene and its derivatives; concept of aromaticity.)
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