Assertion : Photochemical smog is mainly composed of nitrogen oxides, volatile organic compounds, ozone and peroxyacyl nitrates.
Reason : Photochemical smog develops in cold weather conditions by the interaction of secondary pollutants.

Options

A. (a) Both, Assertion and Reason, are true and Reason is the correct explanation of Assertion
B. (b) Both, Assertion and Reason, are true but Reason is not the correct explanation of Assertion
C. (c) If Assertion is true but Reason is false
D. (d) If Assertion is false but Reason is true

Explanation

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that photochemical smog is composed of nitrogen oxides, volatile organic compounds, ozone, and peroxyacyl nitrates.
- This is true, as these components are indeed the main constituents of photochemical smog.

2. **Understanding the Reason**:
- The reason provided states that photochemical smog develops in cold weather conditions due to the interaction of secondary pollutants.
- This is incorrect because photochemical smog actually forms in warm, sunny conditions, not cold weather.

3. **Analyzing the Formation of Photochemical Smog**:
- Photochemical smog is formed when primary pollutants (like nitrogen oxides and volatile organic compounds) react in the presence of sunlight.
- This reaction occurs at high temperatures, leading to the formation of secondary pollutants, including ozone and peroxyacyl nitrates.

4. **Conclusion**:
- Since the assertion is true (photochemical smog is composed of the stated components) and the reason is false (it forms in warm conditions, not cold), we conclude that the correct answer is that the assertion is true and the reason is false.

5. **Final Answer**:
- The answer is Option C: Assertion is true, but the reason is false.