JEE Main levelSingle correct optionDifficulty 2 of 3el228
How many stereoisomers (configurational isomers, geometrical and optical together) does the constitution of the drug shown have?
A2
B8
C3
D4
Answer: D
The compound shown is chloramphenicol. There are two stereocentres (the CH bearing OH and the CH bearing NH), with no symmetry that makes any pair equivalent, so the count is 22=4.