L-threose and L-erythrose

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Multiple Choice

L-threose and L-erythrose

Explanation:
Epimers are stereoisomers that differ at exactly one stereocenter. L-threose and L-erythrose are both aldotetrose sugars with two stereocenters (C2 and C3). In the L-series, they share the same configuration at one of these chiral centers but differ at the other, giving a single-point difference. That makes them epimers. They are not enantiomers, since enantiomers would have opposite configurations at all stereocenters, and they are not unrelated—the two molecules are closely related variations of the same carbon backbone.

Epimers are stereoisomers that differ at exactly one stereocenter. L-threose and L-erythrose are both aldotetrose sugars with two stereocenters (C2 and C3). In the L-series, they share the same configuration at one of these chiral centers but differ at the other, giving a single-point difference. That makes them epimers. They are not enantiomers, since enantiomers would have opposite configurations at all stereocenters, and they are not unrelated—the two molecules are closely related variations of the same carbon backbone.

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