Used primarily as an intermediate in the synthesis of dyes, pigments, and pharmaceuticals. Its sulfonic acid group facilitates solubility and reactivity in aqueous systems, making it valuable in the production of sulfa drugs and other biologically active compounds. Also employed in the manufacture of agrochemicals and surfactants due to its ability to modify molecular polarity and enhance binding characteristics. Commonly utilized in electrophilic aromatic substitution reactions where the chloro and sulfonic groups direct further functionalization of the benzene ring.