Write the IUPAC names and draw structures of the following compounds whose common names are given :
(i) Pyrogallol (ii) Glycerol (iii) Resorcinol

Explanation

To solve the question, we need to determine the IUPAC names and structures for the compounds known as Pyrogallol, Glycerol, and Resorcinol.

### Step 1: Pyrogallol
1. **Identify the structure**: Pyrogallol is a compound that contains three hydroxyl (-OH) groups attached to a benzene ring. The structure can be represented as follows:
- **Structure**:
```
OH
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