What is a Chlorosulfonic acid (HSO₃Cl) ?

Chlorosulfonic acid (HSO₃Cl) is a highly corrosive liquid compound containing both chlorine and sulfonic acid groups (-SO₃H). It is typically a colorless or pale yellow liquid with a strong, pungent odor and reacts easily with moisture. It is widely used in chemical synthesis, particularly in sulfonation reactions, where it introduces the sulfonic acid group into aromatic compounds. Chlorosulfonic acid is essential in the production of dyes, pharmaceuticals, detergents, polymers, and resins. It is a powerful sulfonating agent and is highly corrosive, requiring careful handling.

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