(A) The reaction of benzene diazonium chloride with aniline in a mild alkaline medium is a coupling reaction. This reaction leads to the formation of

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(A) The reaction of benzene diazonium chloride with aniline in a mild alkaline medium is a coupling reaction. This reaction leads to the formation of $p$-aminoazobenzene,which is a yellow dye. The reaction is: $C_6H_5N_2Cl + C_6H_5NH_2 \xrightarrow{pH \approx 4-5} C_6H_5-N=N-C_6H_4-NH_2 + HCl$.