What is diazotisation

Explanation

### Step-by-Step Solution:

**Step 1: Definition of Diazotization**
Diazotization is a chemical reaction that involves the conversion of a primary amine into a diazonium salt. This process is typically carried out using sodium nitrite (NaNO2) in the presence of hydrochloric acid (HCl) at low temperatures (0 to 5 degrees Celsius).

**Step 2: Starting Material**
The reaction usually starts with a primary amine, such as aniline (C6H5NH2). Aniline is a common example of a primary amine used in diazotization.

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