Reactions of the alkenes + alkanes

• General Formula of alkenes

  CnH2n
• General Formula for Alkanes

  CnH2n+2
• Alkenes only have 1 double bond
• Alkenes

  Ethene - C2H4

  Propene - C3H6

  Butene - C4H8
• Alkanes

  Methane - CH4

  Ethane - C2H6

  Propane - C3H8

  Butane - C4H10
• Conditions for a reaction between an alkene and hydrogen(Hydrogenation)


  60°C and a Catalyst
• Conditions for a reaction between and alkene and steam (water)[Hydration]


  300 °C , 60 atmospheres of pressure and phosphoric acid
• To test for alkenes, add bromine water and will turn orange to colourless
• Combustion of alkenes:

  > Smokier, yellow flame - means less efficient

  > Produce soot ( incomplete combustion)

  > Releases less energy than alkanes