A: Teflon has high thermal stability and chemical inertness.
R: Teflon is a thermosetting polymer.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark 1.
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark 2.
C. If Assertion is true statement but Reason is false, then mark 3.
D. If both Assertion and Reason are false statements the mark 4.

Answer

To analyze the given assertion and reason regarding Teflon, we will break down the statements and evaluate their validity step by step.

### Step 1: Evaluate the Assertion
The assertion states: "Teflon has high thermal stability and chemical inertness."

- **Thermal Stability**: Teflon (polytetrafluoroethylene, PTFE) is known for its high thermal stability. This means it can withstand high temperatures without degrading.
- **Chemical Inertness**: Teflon is also chemically inert, meaning it does not react easily with other substances. This is primarily due to the strong carbon-fluorine (C-F) bonds in its structure.

**Conclusion for Step 1**: The assertion is true.

### Step 2: Evaluate the Reason
The reason states: "Teflon is a thermosetting polymer."

- **Thermosetting Polymers**: These are polymers that, once set into a given shape, cannot be remolded or reshaped upon heating. They are typically hard and rigid.
- **Teflon's Properties**: Teflon, on the other hand, is classified as a thermoplastic polymer. Thermoplastics can be softened and reshaped upon heating, which is a key characteristic of Teflon.

**Conclusion for Step 2**: The reason is false.

### Step 3: Final Conclusion
Since the assertion is true and the reason is false, we conclude that the correct relationship is that the assertion is correct, but the reason is incorrect.

### Answer:
The correct answer is that the assertion is true, and the reason is false.

---