JEE Main Chemistry question

During diazotisation of benzenamine (aniline) with sodium nitrite and hydrochloric acid, the excess of hydrochloric acid is used primarily to

(A)check the hydrolysis of the diazonium salt back to Correct
(B)ensure a stoichiometric amount of nitrous acid
(C)check the concentration of free aniline
(D)neutralise any base formed during the reaction

Answer: (A)

Solution

A diazonium salt is prone to hydrolysis (to the corresponding phenol) under neutral or weakly acidic/warm conditions. Using a substantial excess of strong mineral acid (HCl), kept cold, maintains a

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Question ID VK-150372