Alkene can be prepared by
- dehydration of alcohol
- craking of alkane
Dehydration of Alcohol
Dehydration of Ethanol
C2H5OH → C2H4 + H2O
Dehydration of Propanol
C3H7OH → C3H6 + H2O
Dehydration of alcohols using an acid catalyst
Sulphuric acid or Phosphoric acid
Cracking of Alkane
- Cracking is the name given to breaking up large hydrocarbon molecules into smaller and more useful bits.
- This is achieved by using high pressures and temperatures without a catalyst, or lower temperatures and pressures in the presence of a catalyst.
Example: Cracking of butane
Cracking of butane produces a mixture of methane, ethane, ethene and propene.