The number of chiral centres present in threonine is ______.

Number of chiral centres in

The number of chiral corbons present in sucrose is _____.

The number of chiral centers present in glucopyranose is ________

The number of chiral centres present in fructo furanose is

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

The number of chiral centers present in fructo furanose is______

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

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