Write the structures obtained by the epimerisation of `alpha-D`-gluocose at `C-2,C-3`, and `C-4(OH)` groups.

Explanation

To solve the question regarding the structures obtained by the epimerization of α-D-glucose at C-2, C-3, and C-4, we will follow these steps:

### Step 1: Understand the Structure of α-D-Glucose
- The structure of α-D-glucose consists of a six-membered ring (pyranose form) with hydroxyl (OH) groups attached to various carbon atoms.
- The carbon atoms are numbered from 1 to 6, with the anomeric carbon (C-1) having the OH group below the plane of the ring in the α-anomer.

### Step 2: Draw the Structure of α-D-Glucose
- The structure of α-D-glucose can be represented as follows:
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