What is the structural relationship between (2R,3R)-tartaric acid and (2R,3S)-tartaric acid?
Answer and explanation
Correct answer: B. They are diastereomers
- Step 1: Enantiomers are non-superimposable stereoisomers that are complete mirror images of each other, where every chiral center is inverted: vs .
- Step 2: Diastereomers are stereoisomers that are not mirror images of each other, where at least one chiral center is inverted while another remains identical.
- Step 3: Since and have one identical center (2R) and one inverted center (3R vs 3S), they are diastereomers with different physical and chemical properties.
Answer
They are diastereomers.
Why not the others: Enantiomers require inversion of both centers to ; Identical molecules have identical stereochemical descriptors at all centers; Positional isomers have different connectivity of functional groups.
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