Azo-dyes are prepared from

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(A) Azo-dyes are prepared by the coupling reaction of a diazonium salt with an aromatic compound such as an amine or a phenol. The most common startin

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Aniline

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(A) Azo-dyes are prepared by the coupling reaction of a diazonium salt with an aromatic compound such as an amine or a phenol. The most common starting material for the preparation of the diazonium salt is $Aniline$ $(C_6H_5NH_2)$. The reaction involves the coupling of the diazonium cation with an electron-rich aromatic ring,such as $Phenol$ or $Aniline$,to form the azo group $(-N=N-)$. Since $Aniline$ is the primary precursor for the diazonium salt used in the synthesis of almost all azo-dyes,it is the correct answer.

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