Illustrated Glossary of Organic Chemistry

Sulfonic acid: A functional group characterized by a sulfur atom doubly bonded to two oxygen atoms, a hydroxyl group, and a carbon atom of any hybridization. Also the parent member of this class of compounds, HS(=O)₂OH.


General sulfonic acid molecular structure.		Sulfonic acid		Benzenesulfonic acid		Trifluoromethanesulfonic acid (triflic acid; a superacid).