Explain why nylon is called fully synthetic fibre.

Explanation

**Step-by-Step Solution:**

1. **Definition of Synthetic Fiber**: Synthetic fibers are man-made fibers that are created through chemical processes, as opposed to natural fibers which are derived from plants or animals.

2. **Raw Materials for Nylon**: The primary raw materials used in the production of nylon are adipic acid and hexamethylene diamine. Both of these substances are synthesized from chemical processes and are not found in nature.

3. **Chemical Reaction**: The production of nylon involves a chemical reaction between adipic acid and hexamethylene diamine. This reaction leads to the formation of a polymer through a process called polymerization, where smaller molecules (monomers) combine to form a larger molecule (polymer).

...