Reaction of alkenes

Addittion of hydrogen (Hydrogenation)

• This is where a mixture of hydrogen gas and a gaseous alkene is passed over a catalyst (Nickel) at a temperature of 150 degree celsius.
• The hydrogen adds across the double bond and an alkane is formed (Breaks the double bond)
• The product has the same charge as the reactant
• The adding of hydrogen is called hydrogenalisation

Addition of halogens (Halogenations)

• halogens adds across the double bond to give a di-substituted halogenoalkane
• bromine - colourless (test for unsaturated)
• usually with organic compounds
• dehalogenation is the reverse reaction (removal of a halogen)
• beginning of the word is oxy... = with hydrogen

Addition of halogens (Halogenations)

• halogens adds across the double bond to give a di-substituted halogenoalkane
• bromine - colourless (test for unsaturated)
• usually with organic compounds
• dehalogenation is the reverse reaction (removal of a halogen)
• beginning of the word is oxy... = with hydrogen

Addition of hydrogen halides

• hydrogen halides are gasses at room temp(obvs) which are then bubbled in liquid alkenes
• some of the examples of hydrogen halides are HBr, HCl and HI...
• reactivity is opposite to group 7 halogens sooo HI then HCl then HBr then HF
• double bonds are broke

Addition of steam (Hydration of alkenes)

• alcohol produced
• Steam and gaseous alkene are heated with high temp and pressure with catalyst phosphoric acid
• An alcohol has been produced
• Process is sometimes called hydration of alkene.
• double bonds are broken