Benzenesulfonic acid is the simplest member of the class of a benzenesulfonic acids that consists of a benzene carrying a single sulfo group. It is a conjugate acid of a benzenesulfonate.
Benzenesulphonic acid is an organosulfur compound with the formula C6H6O3S. It is the simplest aromatic sulfonic acid. It forms white deliquescent sheet crystals or a white waxy solid that is soluble in water and ethanol, slightly soluble in benzene and insoluble in nonpolar solvents like diethyl ether.