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D - Glucose and D - Mannose are :...

D - Glucose and D - Mannose are :

A

enantiomers

B

functional isomers

C

epimers

D

metamers

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question about D-Glucose and D-Mannose, we need to analyze their structures and the relationship between them. Here’s a step-by-step breakdown: ### Step 1: Understand the Structures - **D-Glucose** and **D-Mannose** are both monosaccharides (simple sugars) and belong to the group of carbohydrates. - They have the same molecular formula (C6H12O6) but differ in the arrangement of atoms. ### Step 2: Identify Asymmetrical Carbons - Both D-Glucose and D-Mannose have multiple asymmetrical (chiral) carbon atoms. - In D-Glucose, the hydroxyl (OH) group on the second carbon (C2) is oriented to the right in the Fischer projection. - In D-Mannose, the hydroxyl (OH) group on C2 is oriented to the left. ### Step 3: Compare the Configuration - The key point in determining the relationship between D-Glucose and D-Mannose is to look at the configuration around the asymmetrical carbon atoms. - They differ in the configuration at only one specific carbon atom (C2), while the other carbon atoms remain unchanged. ### Step 4: Define the Relationship - Since D-Glucose and D-Mannose differ in configuration at only one of their chiral centers, they are classified as **epimers**. - Epimers are a specific type of diastereomer that differ in configuration at only one chiral carbon. ### Conclusion - Therefore, the answer to the question is that D-Glucose and D-Mannose are **epimers**. ---
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