How many of the following are not polyamide fibre?
(I) Nylon- 6,6
(II) Nylon-6
(III) Teffon
(IV) Terylene

Explanation

To determine how many of the listed fibers are not polyamide fibers, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify Nylon-6,6**:
- Nylon-6,6 is formed from hexamethylenediamine and adipic acid.
- It is a type of polyamide because it contains amide linkages (-CONH-).
- **Conclusion**: Nylon-6,6 is a polyamide fiber.
...