With excess bromine water the phenol is brominated at the positions activated by the −OH group, and at the carbon already bearing the sulphonic acid group the incoming bromine displaces −SOX3H in an ipso substitution. The outcome is the brominated phenol in which bromine occupies the ortho and para positions, including the site vacated by the sulphonic acid group.
JEE Main · 2019 · 11 Jan 2019 · Shift 1 · Single correct option