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 determine the correct answer to the question about Terylene (Dacron) being a condensation polymer, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Terylene**: Terylene, also known as Dacron, is a type of polyester. It is formed through a condensation reaction between specific monomers.

2. **Identify the Monomers**: The question provides several options. To find the correct monomers, we need to look for the components that can undergo condensation polymerization to form Terylene.

3. **Recognize Ethylene Glycol**: One of the key monomers involved in the formation of Terylene is ethylene glycol (HOCH2CH2OH). This is a diol, meaning it has two hydroxyl (-OH) groups.

4. **Recognize Dimethyl Terephthalate**: The other monomer is dimethyl terephthalate (C10H10O4), which contains two carboxylate groups (COOH) that can react with the hydroxyl groups of ethylene glycol.

5. **Condensation Reaction**: In the condensation reaction, the hydroxyl groups of ethylene glycol react with the carboxylate groups of dimethyl terephthalate. During this process, water (H2O) is eliminated, leading to the formation of ester linkages and ultimately forming the polymer Terylene.

6. **Final Structure**: The resulting polymer structure consists of repeating units of the ester formed from ethylene glycol and terephthalic acid (the acid form of dimethyl terephthalate).

7. **Conclusion**: Based on the above analysis, the correct answer is that Terylene (Dacron) is a condensation polymer of ethylene glycol and dimethyl terephthalate.

### Answer:
Terylene (Dacron) is a condensation polymer of **ethylene glycol and dimethyl terephthalate**.

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