Azo-dyes are prepared from:

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(A) Azo dyes are prepared by the coupling reaction of diazonium salts with aromatic compounds like phenols or amines.$1$. Aniline $(C_6H_5NH_2)$ react

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Aniline

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(A) Azo dyes are prepared by the coupling reaction of diazonium salts with aromatic compounds like phenols or amines.$1$. Aniline $(C_6H_5NH_2)$ reacts with $NaNO_2$ and $HCl$ at $0-5\,^{\circ}C$ to form benzene diazonium chloride $(C_6H_5N_2^+Cl^-)$.$2$. This diazonium salt then undergoes a coupling reaction with an aromatic compound (e.g.,phenol) in a weakly alkaline medium to produce an azo dye.

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