Which sugar is the carbon-2 epimer of glucose?

### Why this is right Mannose and glucose differ in configuration at carbon 2 while retaining the same configuration at their other chiral centers. Sugars that differ at one chiral center are epimers. ### The other options - **Galactose**: it is the carbon-4 epimer of glucose. - **Fructose**: it is a ketose, not a glucose epimer. - **Ribose**: it is a five-carbon sugar, unlike six-carbon glucose. ### Terms - **Epimer**: one of a pair of sugars that differ at exactly one chiral center. ### Remember Glucose and mannose differ at carbon 2; glucose and galactose differ at carbon 4.