Chlorosulphonic Acid (ClSO₃H) is an extremely powerful sulfonating and chlorinating agent, widely used in industrial chemistry. It is a fuming, oily liquid with a pungent odor and is highly reactive with water and most organic compounds. Produced by reacting sulfur trioxide (SO₃) with hydrogen chloride (HCl), Chlorosulphonic Acid is used to introduce sulfonic acid groups into aromatic...