Which of the following pairs represents anmors?

Options

A.
B.
C.
D.

Explanation

To determine which of the following pairs represents anomers, we first need to understand what anomers are. Anomers are a specific type of stereoisomer that differ in configuration only at the anomeric carbon, which is typically the carbon that was the carbonyl carbon (C=O) in the open-chain form of the sugar. This carbon becomes a new chiral center when the sugar cyclizes to form a ring structure.

### Step-by-Step Solution:

1. **Identify the Anomeric Carbon**:
- In a cyclic sugar (like glucose), the anomeric carbon is the carbon that was the carbonyl carbon in the straight-chain form. For glucose, this is C1.

2. **Understand the Configuration**:
- Anomers differ in the configuration of the hydroxyl group (-OH) attached to the anomeric carbon (C1). If the -OH group is on the same side as the CH2OH group (which is on C5 in glucose), it is called the α-anomer. If it is on the opposite side, it is the β-anomer.

3. **Examine the Given Pairs**:
- Look at the pairs provided in the question. For each pair, identify the structure of the sugars and check the orientation of the hydroxyl group at the anomeric carbon (C1).

4. **Determine if they are Anomers**:
- If one sugar has the -OH group on the bottom (α) and the other has it on the top (β) at C1, then they are anomers.

5. **Conclude**:
- After analyzing the pairs, identify which pair meets the criteria of differing only at the anomeric carbon's hydroxyl group.

### Example:
- If one sugar is α-D-glucose and the other is β-D-glucose, they are anomers because they differ only in the configuration of the -OH group at C1.