1.

How many stereoisomers are possible for threonine?

Answer»

4
6
8
2

Solution :Theronine has two different chiral centres
`CH_(3)underset(OH)underset(|)overset(**)(C)H-underset(+NH_(3))underset(|)overset(**)(C)HCOO^(-)`
Thus, it has four optically active stereoisomers:

NATURALLY occurring theronine its NAME from its relationship to the TETROSE, threose,
I is the correct configuration for NATURAL threonine.
Besides threonine, there are four amino acids that can exist in more than two stereoisomeric forms as they have more than one chiral center: (-) - Cystine (one meso, on pair of ENANTIOMERS), (-) - hydroxylysine (two pairs of enantiomers) (-) hydroxyproline (two pair of enantiomers) and (+ - isolecucine (two pairs of enantiomers).


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