Which of the following statements is not correct?

Options

A. Rayon is a man-made fi bre obtained from wood pulp.
B. Polythcnc and PVC are thermosetting plastics.
C. Stlk and cotton, both are biodegradable polymers.
D. Acrylic is also called synthetic wool.

Explanation

To determine which statement is not correct, let's analyze each one step by step:

1. **Rayon is a man-made fiber obtained from wood pulp.**
- This statement is correct. Rayon is indeed a man-made fiber, and it is derived from cellulose found in wood pulp. The process involves treating wood pulp with chemicals to produce rayon.

2. **Polythene and PVC are thermosetting plastics.**
- This statement is incorrect. Polythene (polyethylene) and PVC (polyvinyl chloride) are classified as thermoplastics, not thermosetting plastics. Thermoplastics can be melted and reshaped multiple times when heated, while thermosetting plastics become rigid and cannot be remolded after being set.

3. **Silk and cotton both are biodegradable polymers.**
- This statement is correct. Both silk and cotton are natural fibers that can be broken down by microorganisms, making them biodegradable.

4. **Acrylic is also called synthetic wool.**
- This statement is correct. Acrylic is often referred to as synthetic wool because it is used as a substitute for wool in various applications.

Now, summarizing the analysis:
- The first statement is correct.
- The second statement is incorrect (this is the answer we are looking for).
- The third statement is correct.
- The fourth statement is correct.

Thus, the statement that is not correct is: **Polythene and PVC are thermosetting plastics.**