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Question

Which of the following will not give halo benzene by reacting with benzene diazonium chloride?

A
Cu2Br2/HBr
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B
KI
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C
SnCl2+HCl
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D
Cu powder +HCl
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Solution

The correct option is C SnCl2+HCl
Benzene diazonium chloride in the presence of Cu2Br2/HBr gives bromobenzene (Sandmeyer reaction).

In the presence of KI, it gives iodobenzene (Gattermann reaction).

In the presence of Cu+HCl, it gives chlorobenzene.

Both chlorobenzene and iodobenzene are halobenzenes.
Benzene diazonium chloride does not form halobenzene with SnCl2+HCl instead it form phenyl hydrazine.

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