What is the structural relationship between D-glucose and D-galactose?
Answer and explanation
Correct answer: D. C-4 epimers differing only in stereochemistry at carbon 4
- Step 1: Epimers are diastereomers that differ in configuration at exactly one stereocenter. Step 2. D-glucose and D-galactose are both aldohexoses identical at carbons 2, 3, and 5, but differing in the orientation of the hydroxyl group at C-4. Answer: C-4 epimers differing only in stereochemistry at carbon 4. Why not the others: D-glucose and D-fructose are constitutional isomers; alpha and beta glucose are C-1 anomers.
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