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In Sandmeyer reaction, what is the intermediate compound formed before adding cuprous halide?

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In Sandmeyer reaction, what is the intermediate compound formed before adding cuprous halide?

(a) Alcohol halide

(b) Diazonium halide

(c) Aqueous halide

(d) None of the mentioned

I have been asked this question during an interview.

My doubt stems from Sandmeyer Reaction topic in section Halogenation of Unit Processes

1 Answer

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Right answer is (b) Diazonium halide

To explain I would say: During the reaction, firstly we prepare the solution of diazonium halide and gradually add it to a solution of the corresponding cuprous halide. Afterwards the diazotization and replacement of the diazo group takes place in one operation.

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