Which of the following statements is not correct ?

Options

A. Terylene is a polyester polymer
B. The monomer of natural rubber is butadiene.
C. Caprolactum is the monomer of nylon - 6
D. Phenol formaldehyde resin is known as Bakelite

Answer

To solve the question "Which of the following statements is not correct?", we will analyze each statement provided in the options.

### Step-by-Step Solution:

1. **Evaluate Statement 1: Terylene is a polyester polymer.**
- Terylene is indeed a polyester made from the reaction of ethylene glycol and terephthalic acid. The polymerization process involves the formation of ester linkages, confirming that Terylene is a polyester.
- **Conclusion:** This statement is correct.

2. **Evaluate Statement 2: Monomer of natural rubber is butadiene.**
- Natural rubber is primarily made from isoprene (2-methyl-1,3-butadiene), not butadiene. Butadiene is a different compound and does not serve as the monomer for natural rubber.
- **Conclusion:** This statement is incorrect.

3. **Evaluate Statement 3: Caprolactam is a monomer of nylon 6.**
- Caprolactam is indeed the monomer used to produce nylon 6. It undergoes polymerization to form nylon 6.
- **Conclusion:** This statement is correct.

4. **Evaluate Statement 4: Phenol formaldehyde resin is Bakelite.**
- Bakelite is a type of phenol-formaldehyde resin. It is formed through the polymerization of phenol and formaldehyde, resulting in a thermosetting plastic.
- **Conclusion:** This statement is correct.

### Final Answer:
The statement that is not correct is: **"Monomer of natural rubber is butadiene."**