Assertion: Teflon is used to coat non-stick cooking pans.
Reason: Teflon is polytetrafluoroethene.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "Teflon is used to coat non-stick cooking pans." This is true because Teflon is known for its non-stick properties, making it ideal for cookware.

2. **Understanding the Reason**: The reason provided is that "Teflon is polytetrafluoroethene." This is also true. Teflon is indeed a polymer made from the monomer tetrafluoroethylene (CF2=CF2), and its chemical name is polytetrafluoroethene.

3. **Analyzing the Relationship**: While both the assertion and the reason are true, we need to determine if the reason correctly explains the assertion. The assertion mentions the use of Teflon in non-stick pans, while the reason describes what Teflon is.

4. **Conclusion**: The assertion is true, and the reason is true, but the reason does not provide a correct explanation for the assertion. The non-stick property of Teflon is due to its chemical structure and properties, but the reason given does not elaborate on how being polytetrafluoroethene leads to its non-stick nature.

5. **Final Answer**: Therefore, the correct conclusion is that the assertion is true, and the reason is true, but the reason is not the correct explanation of the assertion.