Q.

 Benzene diazonium chloride is treated with HBr (excess) in the presence  Of CuBr. The gas released is

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a

Nitrogen

b

Bromine

c

Chlorine

d

Hydrogen

answer is B.

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Detailed Solution

The reaction of Benzene diazonium chloride with HBr (excess) in the presence Of CuBr produces bromobenzene and liberates nitrogen gas. It is a Sandmayer reaction. 

The reaction follows the radical pathway.

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