Relating to a chemical compound containing both chlorine and sulphonic acid groups, used in organic synthesis and dye production.
From chloro- (chlorine) plus sulphonic (containing the sulphonic acid group -SO₃H), a combination of two reactive chemical groups.
Chlorosulphonic acid is a super-aggressive reagent that reacts with almost everything—chemists actually have to use special precautions when handling it because it's so reactive with moisture in the air.
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