Glyptal polymer is obtained from phthalic acid by treating it with

Options

A. Malonic acid
B. Glycerol
C. Maleic acid
D. Ethylene glycol

Explanation

To solve the question about how Glyptal polymer is obtained from phthalic acid, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Monomers**:
- Glyptal is a type of polyester polymer. The primary monomers involved in the formation of Glyptal are phthalic acid and ethylene glycol.

2. **Understand the Reaction**:
- Glyptal is synthesized through a condensation reaction between phthalic acid (a dicarboxylic acid) and ethylene glycol (a diol). In this reaction, the hydroxyl (-OH) groups from the glycol and the carboxyl (-COOH) groups from the acid react to form ester linkages.

3. **Write the Reaction**:
- The reaction can be represented as:
\[ \text{Phthalic Acid} + \text{Ethylene Glycol} \rightarrow \text{Glyptal} + \text{Water} \]
- In this reaction, each ester bond formation releases a molecule of water (H2O).

4. **Conclusion**:
- Therefore, Glyptal is obtained by treating phthalic acid with ethylene glycol. The correct answer to the question is option number four: ethylene glycol.