IB Chemistry SL

Revision Notes

10.2.4 Alkenes - Hydrogenation

Hydrogenation of Alkenes

  • Alkenes are very useful compounds as they can undergo many types of reactions
  • They can therefore be used as starting molecules when making new compounds
  • The reaction between an alkene and hydrogen is known as hydrogenation or reduction
  • As well as a nickel catalyst, this requires a temperature of 200 °C and a pressure of 1000 kPa

Hydrocarbons Electrophilic Addition Reactions, downloadable AS & A Level Chemistry revision notes

The diagram shows an overview of the different electrophilic addition reactions alkenes can undergo

  • One important application of this reaction is in the production of margarine from vegetable oils
  • Vegetable oils are unsaturated and may be hydrogenated to make margarine, which has a higher melting point due to stronger London Dispersion Forces
  • By controlling the conditions it is possible to restrict the how many of the C=C bonds are broken and produce partially hydrogenated vegetable oils which have which have the desired properties and textures for magarine manufcture



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