Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Ans. (C) L, L.

Sol. In a Fischer projection the horizontal bonds project towards the viewer. (a) Alanine: priorities NH₂ $>$ CO₂H $>$ CH₃ $>$ H; with CO₂H up and NH₂ on the left the configuration is S, and for amino acids S = L. (b) 2-Aminobutanoic acid: priorities NH₂ $>$ CO₂H $>$ CH₂CH₃ $>$ H; the same left-NH₂ arrangement : S = L. Hence L, L.