D-glucose and D-galactose

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Multiple Choice

D-glucose and D-galactose

Explanation:
Epimers are stereoisomers that differ in configuration at exactly one chiral center while the other stereocenters are the same. D-glucose and D-galactose share the same carbon backbone and have the same configuration at all chiral centers except one—the carbon that bears the hydroxyl group at the fourth position. In one sugar that hydroxyl points in one direction, and in the other it points the opposite way. That single difference makes them epimers. This is distinct from enantiomers, which would invert every chiral center and be non-superimposable mirror images, and from anomers, which differ at the anomeric carbon in cyclic forms.

Epimers are stereoisomers that differ in configuration at exactly one chiral center while the other stereocenters are the same. D-glucose and D-galactose share the same carbon backbone and have the same configuration at all chiral centers except one—the carbon that bears the hydroxyl group at the fourth position. In one sugar that hydroxyl points in one direction, and in the other it points the opposite way. That single difference makes them epimers. This is distinct from enantiomers, which would invert every chiral center and be non-superimposable mirror images, and from anomers, which differ at the anomeric carbon in cyclic forms.

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