Which of the following components of photochemical smog act as powerful eye irritants?
`O_3`
PAN
Hydrocarbon

Options

A. II and III
B. I and II
C. I and III
D. All of these

Answer

To solve the question regarding which components of photochemical smog act as powerful eye irritants, we can follow these steps:

### Step 1: Understand Photochemical Smog
Photochemical smog is a type of air pollution that occurs when sunlight reacts with pollutants such as volatile organic compounds (VOCs) and nitrogen oxides (NOx). This reaction produces various harmful substances, including ozone (O₃) and peroxyacetyl nitrate (PAN).

**Hint:** Recall that photochemical smog is formed from the reaction of sunlight with certain pollutants.

### Step 2: Identify the Components Listed
The question provides three components of photochemical smog:
1. Ozone (O₃)
2. Peroxyacetyl nitrate (PAN)
3. Hydrocarbons

**Hint:** List out the components and remember that not all components of smog are irritants.

### Step 3: Determine the Effects of Each Component
- **Ozone (O₃):** Known to be a powerful irritant to the eyes and respiratory system.
- **Peroxyacetyl nitrate (PAN):** Also recognized as an eye irritant and can cause respiratory issues.
- **Hydrocarbons:** Generally do not act as powerful eye irritants.

**Hint:** Consider the health effects associated with each component, especially in terms of eye irritation.

### Step 4: Analyze the Options
From the analysis:
- Ozone (O₃) is an eye irritant.
- PAN is an eye irritant.
- Hydrocarbons are not typically classified as eye irritants.

**Hint:** Focus on the specific properties of each compound to determine their effects.

### Step 5: Select the Correct Answer
Based on the information gathered:
- Both Ozone and PAN cause eye irritation.
- Hydrocarbons do not cause eye irritation.

Thus, the correct answer to the question is that the components of photochemical smog that act as powerful eye irritants are Ozone and PAN.

### Final Answer:
The correct answer is: **Ozone (O₃) and PAN.**