The number of chiral centres in penicillin is ____
Answer: 3
Solution
Penicillin carries three stereocentres: the carbon bearing the acylamino side chain, the bridgehead carbon of the β-lactam ring, and the carbon holding the carboxyl group on the thiazolidine ring. The number of chiral centres is thus three.
JEE Main · 2020 · 08 Jan 2020 · Shift 1 · Integer answer