Which of the following polymers are used as fibre ?

Options

A. Nylon
B. Polythetrafluoroethene
C. Terylene
D. Buna-S

Answer

To determine which of the given polymers are used as fibers, we need to analyze each option based on their bonding characteristics and structural properties. Here’s the step-by-step breakdown:

### Step 1: Identify the Options
The options provided are:
1. Nylon
2. Polytetrafluoroethylene (PTFE)
3. Terephthalene
4. Bunase

### Step 2: Analyze Each Polymer

#### Option 1: Nylon
- **Structure**: Nylon is a polyamide, which contains repeating units with strong hydrogen bonds due to the presence of -NH (amine) and -CO (carbonyl) groups.
- **Bonding**: The strong hydrogen bonding between the NH groups and the carbonyl oxygen (C=O) contributes to its strength and elasticity.
- **Conclusion**: Nylon is commonly used as a fiber due to its strong bonding and elasticity.

#### Option 2: Polytetrafluoroethylene (PTFE)
- **Structure**: PTFE is made up of repeating units of CF2.
- **Bonding**: It lacks strong intermolecular forces such as hydrogen bonding; instead, it has weak van der Waals forces.
- **Conclusion**: PTFE is not suitable for fiber production due to its weak bonding.

#### Option 3: Terephthalene
- **Structure**: Terephthalene is derived from terephthalic acid and ethylene glycol, forming polyethylene terephthalate (PET).
- **Bonding**: While there are dipole-dipole interactions, they are not as strong as hydrogen bonds.
- **Conclusion**: Terephthalene does not have sufficient bonding strength to be used as a fiber.

#### Option 4: Bunase
- **Structure**: Bunase is a copolymer of butadiene and styrene.
- **Bonding**: It also lacks strong intermolecular forces and primarily exhibits weak van der Waals forces.
- **Conclusion**: Bunase is not suitable for fiber production.

### Step 3: Final Conclusion
After analyzing all the options, the only polymer that can be used as a fiber due to its strong bonding characteristics is **Nylon**.

### Answer:
**The polymer used as fiber is Nylon.**

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