Formation of photochemical smog involves the following reaction in which `A,B` and `C` are respectively.
(i) `NO_(2) longrightarrow A+B`
(ii) `B+O_(2)longrightarrow C`
(iii) `A+C longrightarrow NO_(2)+O_(2)`
Choose the correct answer from the options given below :

Options

A. `N,O_(2)&O_(3)`
B. `NO,O&O_(3)`
C. `O,NO_(2)&NO`
D. `O,NO&NO_(3)^(-)`

Answer

To solve the problem, we need to analyze the given reactions step by step to identify the compounds A, B, and C.

### Step 1: Analyze the first reaction
The first reaction given is:
\[ \text{NO}_2 \longrightarrow A + B \]

When nitrogen dioxide (NO₂) is heated, it can dissociate into nitrogen monoxide (NO) and oxygen (O₂). Thus, we can identify:
- \( A = \text{NO} \) (Nitric oxide)
- \( B = \text{O}_2 \) (Oxygen)

### Step 2: Analyze the second reaction
The second reaction is:
\[ B + \text{O}_2 \longrightarrow C \]

From our previous step, we identified \( B \) as \( \text{O}_2 \). Therefore, we can rewrite the reaction as:
\[ \text{O}_2 + \text{O}_2 \longrightarrow C \]

This reaction typically leads to the formation of ozone (O₃) when oxygen molecules react under certain conditions (like in the presence of UV light). Thus, we can identify:
- \( C = \text{O}_3 \) (Ozone)

### Step 3: Analyze the third reaction
The third reaction is:
\[ A + C \longrightarrow \text{NO}_2 + \text{O}_2 \]

Substituting our identified compounds:
\[ \text{NO} + \text{O}_3 \longrightarrow \text{NO}_2 + \text{O}_2 \]

This reaction shows that nitric oxide reacts with ozone to regenerate nitrogen dioxide and produce more oxygen.

### Summary of Identifications
- \( A = \text{NO} \) (Nitric oxide)
- \( B = \text{O}_2 \) (Oxygen)
- \( C = \text{O}_3 \) (Ozone)

### Conclusion
The correct identification of A, B, and C in the context of the formation of photochemical smog is:
- \( A = \text{NO} \)
- \( B = \text{O}_2 \)
- \( C = \text{O}_3 \)