When propene C3H6 reacts with sulfuric acid H2SO4 in an electrophilic addition reaction, the double bond in propene is broken, and the sulfuric acid molecule adds across the double bond. The reaction forms an intermediate alkyl hydrogen sulfate ester. In the case of propene, it forms 2-propyl hydrogen sulfate CH3-CH SO4H -CH3 as the intermediate.When this intermediate is treated with water, the alkyl hydrogen sulfate ester is hydrolyzed, and the sulfate group is replaced by a hydroxyl group OH . This results in the formation of 2-propanol CH3-CH OH -CH3 as the final product.