3c) Alkenes

• general formula - CnH2n
• double bond - unsaturated 

Ethene		C2H4
Propene		C3H6
Butene		C4H8

Butene Isomers:

Isomers have the same molecular formula,but a different structural formula 

Commonly represented as:

Methylpropene:

Addition reaction of alkenes and bromine

Test for C = C, Add Bromine water
It turns from orange to colourless