A synthetic polyamide prepared by prolonged heating of caporlactam is

Options

A. nylon 6,6
B. nylon 6
C. nylon 6,10
D. glyptal.

Answer

To solve the question, we need to identify the synthetic polyamide formed by the prolonged heating of caprolactam.

### Step-by-Step Solution:

1. **Identify the Monomer**:
The monomer given in the question is caprolactam.

2. **Understand the Structure of Caprolactam**:
Caprolactam is a cyclic amide (lactam) with the chemical structure:
\[ \text{C}_6\text{H}_{11}\text{NO} \]
It contains a carbonyl group (C=O) and an amine group (NH).

3. **Polymerization Process**:
When caprolactam is subjected to prolonged heating, it undergoes a process called ring-opening polymerization. This process involves the breaking of the lactam ring, allowing the monomers to link together.

4. **Formation of the Polymer**:
During the polymerization, the amine group of one caprolactam molecule reacts with the carbonyl group of another caprolactam molecule. This results in the formation of a long chain of repeating units. The structure of the polymer can be represented as:
\[ -\text{NH}-\text{(CH}_2\text{)}_5-\text{CO}-\text{NH}-\text{(CH}_2\text{)}_5-\text{CO}-\ldots \]
This polymer is known as nylon 6.

5. **Conclusion**:
After the prolonged heating of caprolactam, the synthetic polyamide produced is nylon 6.

### Final Answer:
The synthetic polyamide prepared by prolonged heating of caprolactam is **nylon 6**.

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