The relation between glucose and mannose is

Options

A. Anomers
B. Disaccharides
C. Epimers
D. Ketohexoses

Answer

To determine the relationship between glucose and mannose, we can follow these steps:

### Step 1: Identify the Structures of Glucose and Mannose
- **Glucose**: It is an aldohexose, meaning it has an aldehyde group and six carbon atoms. The structure can be represented as:
- C1: Aldehyde group (CHO)
- C2: Hydroxyl group (OH)
- C3: Hydroxyl group (OH)
- C4: Hydroxyl group (OH)
- C5: Hydroxyl group (OH)
- C6: CH2OH

- **Mannose**: It is also an aldohexose with the same molecular formula as glucose but differs in the arrangement of hydroxyl groups. The structure is:
- C1: Aldehyde group (CHO)
- C2: Hydroxyl group (OH)
- C3: Hydroxyl group (H)
- C4: Hydroxyl group (OH)
- C5: Hydroxyl group (OH)
- C6: CH2OH

### Step 2: Analyze the Configuration of the Carbons
- Both glucose and mannose have the same molecular formula (C6H12O6) and differ in the configuration around specific carbon atoms.
- The key difference lies in the configuration at the C2 carbon atom:
- In glucose, the hydroxyl group on C2 is on the right.
- In mannose, the hydroxyl group on C2 is on the left.

### Step 3: Define the Relationship
- The difference in configuration at the C2 carbon indicates that glucose and mannose are **epimers**.
- **Epimers** are defined as two sugars that differ in configuration at only one specific carbon atom.

### Step 4: Conclusion
- Therefore, the relationship between glucose and mannose is that they are **C2 epimers** of each other.

### Final Answer
The relation between glucose and mannose is that they are **epimers** (specifically C2 epimers).

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