Statement-1. Photochemical smog is a combination of photons with smoke and fog.
Statement-2. Photochemical smog is formed in the troposphere.

Options

A. Statement-1 is True, Statement-2 is True : Statement-2 is a correct explanation for Statement-1
B. Statement-1 is True, Statement-2 is True : Statement-2 is not a correct explanation for Statement-1
C. Statement-1 is True, Statement-2 is False
D. Statement-1 is False, Statement-2 is True

Explanation

To analyze the given statements regarding photochemical smog, we will evaluate each statement step by step.

### Step 1: Understanding Statement-1
- **Statement-1**: "Photochemical smog is a combination of photons with smoke and fog."
- **Analysis**: The term "photochemical smog" refers to a type of air pollution that is formed when sunlight (photons) reacts with pollutants such as nitrogen oxides (NOx) and volatile organic compounds (VOCs). While it does involve light (photons), it is not accurate to say it is simply a combination of photons with smoke and fog. The term "smog" traditionally refers to a mixture of smoke and fog, but photochemical smog specifically arises from chemical reactions in the atmosphere.

### Step 2: Understanding Statement-2
- **Statement-2**: "Photochemical smog is formed in the troposphere."
- **Analysis**: This statement is correct. Photochemical smog typically forms in the troposphere, which is the lowest layer of Earth's atmosphere. It is in this layer that the necessary conditions (sunlight and the presence of pollutants) for the formation of photochemical smog occur.

### Conclusion
- **Statement-1** is **False** because it inaccurately describes the nature of photochemical smog.
- **Statement-2** is **True** because it correctly identifies the troposphere as the location where photochemical smog is formed.

### Final Answer
- Statement-1 is False.
- Statement-2 is True.