JEE Main Chemistry question

During the coupling reaction of benzenediazonium chloride and aniline, the pH of the reaction medium should be approximately

(A)1-2
(B)9-10
(C)4-5Correct
(D)7-8

Answer: (C)

Solution

Coupling with an amine (as opposed to a phenol) works best in a weakly acidic medium, around pH 4-5: this keeps most of the aniline in its free (unprotonated, nucleophilic) form while being acidic enough to keep the diazonium salt

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Question ID VK-150356