Assign Cahn-Ingold-Prelog priorities at each stereocentre and look with the lowest-priority group, hydrogen, pointing away. At C-2 the order OH>COOH>CHClCHX3>H traces anticlockwise, which is S. At C-3 the order Cl>CH(OH)COOH>CHX3>H traces clockwise, which is R. The absolute configuration is 2S, 3R.
JEE Main · 2016 · 03 Apr 2016 · Offline · Single correct option