(B) When benzene diazonium chloride reacts with aniline in the presence of dilute $HCl$ at a low temperature $(273-278 \ K)$,an electrophilic substitu

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(B) When benzene diazonium chloride reacts with aniline in the presence of dilute $HCl$ at a low temperature $(273-278 \ K)$,an electrophilic substitution reaction occurs at the para-position of the aniline ring. This process is known as coupling reaction,which yields $p$-aminoazobenzene,a yellow-colored dye.