Question

Why is benzene diazonium chloride not stored and is used immediately after its preparation?

Answer 1

Benzene diazonium chloride is very unstable. The salts decompose into aromatic compounds and nitrogen gas, both of which are highly stable and hence the diazonium salt tends to decompose to form stable products.

Due to its instability, the benzene diazonium chloride is not generally stored and is used immediately after its preparation.

Diazonium group is a very good leaving group. It is substituted by other groups such as $I^{-},B{r}^{-},N^{-}$ and $H^{-}$ and highly stable nitrogen gas from the aromatic ring is released during the process.