Which of the following is not a synthetic fibre ?

Options

A. Rubber
B. Nylon-6
C. Nylon-6,6
D. Nylon-6,10

Answer

To determine which of the given options is not a synthetic fiber, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understand the Definition of Synthetic Fiber**:
- Synthetic fibers are man-made fibers, typically produced from chemical processes. They are distinct from natural fibers, which are derived from plants or animals.

2. **Evaluate Each Option**:
- **Option 1: Rubber**
- Rubber is not classified as a fiber. It is categorized as an elastomer, which is a type of polymer that exhibits elastic properties. Therefore, rubber does not fit the definition of a synthetic fiber.

- **Option 2: Nylon-6**
- Nylon-6 is a synthetic fiber made from petrochemicals. It is widely used in textiles and is classified as a polyamide. Thus, it is a synthetic fiber.

- **Option 3: Nylon-6-6**
- Similar to Nylon-6, Nylon-6-6 is also a synthetic fiber and is another type of polyamide. It is commonly used in various applications, including clothing and industrial products.

- **Option 4: Nylon-6-10**
- Nylon-6-10 is another synthetic fiber, also belonging to the polyamide family. It is produced from different monomers compared to Nylon-6 and Nylon-6-6 but is still considered a synthetic fiber.

3. **Conclusion**:
- After evaluating all options, we find that options 2, 3, and 4 (Nylon-6, Nylon-6-6, and Nylon-6-10) are all synthetic fibers. However, rubber (option 1) is not a synthetic fiber, as it is classified as an elastomer.

### Final Answer:
- The correct answer is **Option 1: Rubber**.

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