Terylene (Dacron) is a condensation polymer of

Options

A. Formaldehyde and urea
B. Ethylene glycol and ethylene diisocyanate
C. Ethylene glycol and dimethyl terephthalate
D. Maleic anhydride and methyelene glycol

Answer

To answer the question, "Terylene (Dacron) is a condensation polymer of what?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Components of Terylene (Dacron)**:
Terylene, also known as Dacron, is a synthetic polymer. It is formed from two main monomers: ethylene glycol and dimethyl terephthalate.

2. **Understand the Structure of the Monomers**:
- **Ethylene Glycol**: The chemical formula is C2H6O2, which can be represented as HO-CH2-CH2-OH.
- **Dimethyl Terephthalate**: The chemical formula is C10H10O4, which can be represented as (C6H4(CO2CH3)2).

3. **Polymerization Process**:
Terylene is formed through a condensation reaction, where the two monomers (ethylene glycol and dimethyl terephthalate) react together. During this reaction, small molecules such as methanol (CH3OH) are eliminated.

4. **Formation of Terylene**:
The reaction can be summarized as follows:
- Ethylene glycol reacts with dimethyl terephthalate.
- The hydroxyl (-OH) group from ethylene glycol reacts with the ester (-OCH3) group from dimethyl terephthalate.
- This reaction leads to the formation of an ester linkage and the release of methanol.

5. **Final Structure of Terylene**:
The resulting polymer, Terylene, consists of repeating units derived from the two monomers. The structure will have alternating units of ethylene glycol and terephthalate.

### Conclusion:
Terylene (Dacron) is a condensation polymer formed from **ethylene glycol** and **dimethyl terephthalate**.