Identify the correct statements.,
(i) Winter smog is reducing in nature due to presence of particular carbon and `SO_(2)`
(ii)The pollutant obtained from emission tubes of diesel engines is benzopyrene.
(iii) Photochemical smog is made up of PAN , `O_(3)` and oxides of nitrogen
(iv) CFCs are stable in troposphere and act as pollutants in stratosphere

Options

A. (ii),(iii) and (iv)
B. (i),(iii)and (iv)
C. (i), (ii) and (iii)
D. all of these

Answer

To identify the correct statements regarding environmental chemistry, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (i)**: "Winter smog is reducing in nature due to presence of particulate carbon and `SO_(2)`."
- **Analysis**: Winter smog is indeed characterized by the presence of smoke (particulate carbon) and sulfur dioxide (`SO_(2)`). These components contribute to the reducing nature of winter smog. Thus, this statement is **correct**.

2. **Statement (ii)**: "The pollutant obtained from emission tubes of diesel engines is benzopyrene."
- **Analysis**: Benzopyrene is a polycyclic aromatic hydrocarbon that is indeed emitted from diesel engines due to incomplete combustion. It is recognized as a pollutant. Therefore, this statement is also **correct**.

3. **Statement (iii)**: "Photochemical smog is made up of PAN, `O_(3)` and oxides of nitrogen."
- **Analysis**: Photochemical smog is formed when pollutants such as nitrogen oxides and volatile organic compounds react in the presence of sunlight. It includes components like ozone (`O_(3)`) and peroxyacetyl nitrate (PAN). Thus, this statement is **correct**.

4. **Statement (iv)**: "CFCs are stable in troposphere and act as pollutants in stratosphere."
- **Analysis**: Chlorofluorocarbons (CFCs) are stable in the troposphere, allowing them to reach the stratosphere, where they break down ozone and act as pollutants. This statement is also **correct**.

### Conclusion:
All four statements are correct.

### Final Answer:
All statements (i), (ii), (iii), and (iv) are correct.

---