Write the chemical equation for the following.
What happens when benzene diazonium chloride reacts with phenol in weak alkaline medium? (Give balanced equation).
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Answer
AIEquation: $\mathrm{C_{6}H_{5}N_{2}Cl} + \mathrm{C_{6}H_{5}OH} \xrightarrow{\text{NaOH}\text{ }\text{(weak}\text{ }\text{alkaline)}\text{,}\text{ }\text{273-278}\text{ }\text{K}} \mathrm{C_{6}H_{5}N=NC_{6}H_{4}OH} + \mathrm{HCl}$
Reaction: Coupling reaction
Product: 4-hydroxyazobenzene (p-hydroxyazobenzene)
Benzenediazonium chloride couples with phenol at the para position to give p-hydroxyazobenzene, an orange azo dye.