We can put alcohol through a process of elimination, also known as dehydration (we’re eliminating water from the alcohol) in order to form alkenes or alkoxyalkanes.

The product that forms will depends on the conditions used in the elimination reaction.

For instance alkenes are formed in the presence of H2SO4 and the correct temperature to cause the alcohol to lose water molecules.

In laboratory conditions an aluminium oxide catalyst would also be used to dehydrate the alcohol.

The temperature for primary alcohols must be kept above 170ºC to prevent formation of ethers.

The elimination process in this case would leave us with alkene and water.

To illustrate that a dehydration reaction had taken place we would carry out a test with bromine water. If any C=C double bonds are present the bromine will change to a colourless solution.