Which of the following compounds show self ionisation in liquid state?

Options

A. `NO_(2)`
B. `ClF_(3)`
C. `BrF_(5)`
D. `PCl_(5)`

Answer

To determine which of the given compounds show self-ionization in the liquid state, we will analyze the self-ionization reactions for each compound mentioned in the video transcript.

### Step 1: Analyze NO2
- **Reaction**: NO2 + NO2 → NO+ + NO3−
- **Conclusion**: NO2 shows self-ionization as it forms NO+ and NO3− ions.

### Step 2: Analyze ClF3
- **Reaction**: ClF3 + ClF3 → ClF2+ + ClF4−
- **Conclusion**: ClF3 also shows self-ionization as it forms ClF2+ and ClF4− ions.

### Step 3: Analyze BrF5
- **Reaction**: BrF5 + BrF5 → BrF4+ + BrF6−
- **Conclusion**: BrF5 shows self-ionization as it forms BrF4+ and BrF6− ions.

### Step 4: Analyze PClF5
- **Reaction**: PClF5 + PClF5 → (No self-ionization reaction observed)
- **Conclusion**: PClF5 does not show self-ionization.

### Final Conclusion
The compounds that show self-ionization in the liquid state are:
1. NO2
2. ClF3
3. BrF5

PClF5 does not show self-ionization.