Alcohols Phenols and EthersmediumNUMERICAL

The initial step in the preparation of phenol from a diazonium salt requires the diazotization of anAlcohols Phenols and Ethers Chemistry Question

Question

The initial step in the preparation of phenol from a diazonium salt requires the diazotization of aniline using a mixture of $NaNO_2$ and $HCl$. What is the strictly enforced upper limit of the optimal temperature range in degrees Celsius ($^\circ\text{C}$) to prevent the explosive decomposition of the diazonium salt intermediate?

Answer: 5

💡 Solution & Explanation

Diazotization of primary aromatic amines must be carried out in an ice bath. The specific critical temperature range detailed in the standard chemical protocol is $273\text{ K}$ to $278\text{ K}$, which corresponds precisely to $0^\circ\text{C}$ to $5^\circ\text{C}$. The upper limit is therefore $5^\circ\text{C}$.

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