How is ethene prepared from ethanol? Give the reaction involved in it.

Ethanol can be converted into ethene by the dehydration reaction.

The chemical equation for the reaction is given below:

$CH_3-CH_2OH → CH_2=CH_2 + H_2O$

When ethanol is heated with concentrated sulphuric acid at 170^oC, ethanol gets dehydrated to form ethene, an unsaturated hydrocarbon.