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: Understand the Structures of Glucose and Mannose
- Glucose and mannose are both hexoses (six-carbon sugars) and are classified as aldoses because they contain an aldehyde group (-CHO).
- The molecular formula for both glucose and mannose is C6H12O6.

### Step 2: Draw the Structures
- **Glucose Structure**:
- The structure of glucose can be represented as:
```
CHO
|
H-C-OH
|
HO-C-H
|
H-C-OH
|
CH2OH
```
- **Mannose Structure**:
- The structure of mannose can be represented as:
```
CHO
|
H-C-OH
|
HO-C-H
|
HO-C-H
|
CH2OH
```

### Step 3: Compare the Structures
- When comparing the structures of glucose and mannose, we observe that they differ only in the orientation of the hydroxyl (-OH) group at one specific carbon atom (the second carbon).
- In glucose, the -OH group on the second carbon is on the right side, while in mannose, it is on the left side.

### Step 4: Define the Relationship
- Since glucose and mannose differ only in the configuration around one carbon atom, they are classified as **epimers**.
- Epimers are a type of stereoisomer that differ in configuration at only one specific carbon atom.

### Conclusion
- Therefore, the relationship between glucose and mannose is that they are **epimers**.