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The reaction $A r \mathrm{~N}_{2}^{+} \mathrm{Cl}^{-} \stackrel{\mathrm{Cu} / \mathrm{HCl}}{\longrightarrow} \mathrm{ArCl}+\mathrm{N}_{2}+\mathrm{CuCl}$ is called as
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Gattermann reaction
The given reaction is Gattermann reaction. In this reaction, chlorine or bromine can be introduced in the benzene ring by treating the diazonium salt solution with corresponding halogen acid in the presence of copper powder.
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