The number of chiral centres present in [B] is .........

Number of chiral centres in

The chiral centre is absent in :

The number of chiral centres present in threonine is ______.

Levonorgestrel is a commonly used contraceptive. The number of chiral centres present in this molecule is:

Number of chiral centres in Pencillin is

Number of chiral centres in Pencillin is

The number of chiral centres present in fructo furanose is