Question

Which of the following is an example for fibre?

• A.
• B.
• C.
• D.

Hint:

Polyesters such as PET are widely used in textile industries due to their high strength, resistance to stretching and shrinking, and quick-drying properties.

Answer 1

The Correct Option is D

Step 1: Understanding Fibre Polymers 
Fibres are polymers that exhibit high tensile strength and elasticity, making them suitable for textile and industrial applications. 
Step 2: Analyzing the Given Options 
1. Polyvinyl chloride (PVC) - \(\left[ \text{CH}_2 - \text{CH} - \text{Cl} \right]_n\) 
✖ This is a thermoplastic polymer, not a fibre. 2. Polyethylene (PE) - \(\left[ \text{CH}_2 - \text{CH}_2 \right]_n\) 
✖ This is a simple plastic material, not a fibre. 3. Polyvinylidene chloride (PVDC) - \(\left[ \text{CH}_2 - \text{C} - \text{CH} - \text{CH}_2 \right]_n\) (Cl attached to C) 
✖ This is used for packaging materials but not a fibre. 4. Polyethylene terephthalate (PET) - \(\left[ \text{OC} - \text{CO} - \text{O} - \text{CH}_2 \text{CH}_2 \text{O} - \text{CO} - \text{O} \right]_n\) 
✔ This is a fibre polymer known as polyester, commonly used in fabrics. 
Step 3: Conclusion 
Since PET is widely used as a fibre material, the correct answer is: \[ \boxed{\left[ \text{OC} - \text{CO} - \text{O} - \text{CH}_2 \text{CH}_2 \text{O} - \text{CO} - \text{O} \right]_n} \]