What is the most suitable temperature for the formation of a diazonium salt from aniline ?

Options

A. 0K
B. 273K
C. `0^@C`
D. `100^@C`

Answer

To determine the most suitable temperature for the formation of a diazonium salt from aniline, we can follow these steps:

### Step 1: Understand the Reaction
Aniline (C6H5NH2) reacts with nitrous acid (HNO2) to form a diazonium salt (C6H5N2Cl). The reaction is typically carried out in an acidic medium, often using hydrochloric acid (HCl) to generate nitrous acid in situ.

### Step 2: Identify the Temperature Conditions
The formation of diazonium salts is sensitive to temperature. Higher temperatures can lead to decomposition of the diazonium salt, while lower temperatures help stabilize it.

### Step 3: Optimal Temperature
The most suitable temperature for the formation of diazonium salts from aniline is around 0 degrees Celsius (0°C). This low temperature helps in minimizing the decomposition of the diazonium salt and ensures a higher yield.

### Step 4: Conclusion
Thus, the most suitable temperature for the formation of a diazonium salt from aniline is 0°C.

---