Which of the following processes represents the 'desulphonation' of benzene sulphonic acid to yield — Aromatic Hydrocarbons Chemistry Question

💡 Solution & Explanation

The electrophilic aromatic substitution reaction of sulphonation is reversible. When benzene sulphonic acid is heated with superheated steam under pressure (dilute acid, high water concentration), the equilibrium is shifted towards the reactants, yielding benzene and sulfuric acid. This process is called desulphonation.