Diazo-coupling is useful to prepare some

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(C) Diazo-coupling reactions involve the reaction of a diazonium salt with an aromatic compound (like phenols or amines) to form azo compounds. These

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(C) Diazo-coupling reactions involve the reaction of a diazonium salt with an aromatic compound (like phenols or amines) to form azo compounds. These azo compounds are characterized by the $-N=N-$ linkage and are extensively used as synthetic dyes due to their intense colors. For example,the reaction of benzene diazonium chloride with aniline produces $p$-aminoazobenzene,which is a yellow dye.

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