MolSynapsequestion bank

MolSynapse / Question bank / Biomolecules / Amino acids: zwitterions, isoelectric point

JEE Main levelSingle correct optionDifficulty 2 of 3bm066

The total number of stereoisomers possible for the amino acid threonine, $CH X_{3} - CH (OH) - CH (NH X_{2}) - COOH$ , is

A2
B3
C4
D8

Answer: C

Threonine has two stereocentres (C2 bearing

NH X_{2}

and C3 bearing

OH

) that are not equivalent. The number of stereoisomers is

2^{2} = 4

(two enantiomeric pairs); the natural one is L-threonine.

Practice Biomolecules More on Amino acids: zwitterions, isoelectric point

Previous questionNext question

More questions on Amino acids: zwitterions, isoelectric point