Which of the following pair does not show correct relationship ?

Options

A. Isoprene : Natural rubber
B. Nylon : Polyamide
C. Nylon-6 : Adipic acid
D. Ziggler Natta catalyst : `TiCl_(4)+(C_(2)H_(5))_(3)` Al

Answer

To determine which of the following pairs does not show the correct relationship, we will analyze each pair one by one.

### Step 1: Analyze the first pair - Isoprene and Natural Rubber
- **Isoprene** is a monomer that polymerizes to form **Natural Rubber**.
- Natural rubber is essentially **polyisoprene**, which is a polymer made from isoprene units.
- **Conclusion**: This pair is correct.

### Step 2: Analyze the second pair - Nylon and Polyamide
- **Nylon** refers to a group of synthetic polymers known as **polyamides**.
- Polyamides are characterized by the presence of amide linkages in their structure.
- **Conclusion**: This pair is also correct.

### Step 3: Analyze the third pair - Nylon 6 and Adipic Acid
- **Nylon 6** is a type of polyamide that is made from **caprolactam**, not adipic acid.
- Adipic acid is used in the production of **Nylon 66**, which is a different type of nylon.
- **Conclusion**: This pair is incorrect.

### Step 4: Analyze the fourth pair - Ziegler-Natta Catalyst and High-Density Polyethylene
- The **Ziegler-Natta catalyst** is indeed used in the polymerization process to produce **high-density polyethylene (HDPE)**.
- This catalyst facilitates the formation of polymers from monomers.
- **Conclusion**: This pair is correct.

### Final Conclusion:
The pair that does not show the correct relationship is **Nylon 6 and Adipic Acid**.

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