In the Gattermann reaction, which of the foll | vedclass

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(B) $1$. The Gattermann reaction is a modification of the Sandmeyer reaction.$2$. In the Sandmeyer reaction, $Cu_2Cl_2$ or $Cu_2Br_2$ is used as a cat

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Copper powder and $HCl$ or $HBr$

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(B) $1$. The Gattermann reaction is a modification of the Sandmeyer reaction.$2$. In the Sandmeyer reaction, $Cu_2Cl_2$ or $Cu_2Br_2$ is used as a catalyst.$3$. In the Gattermann reaction, copper powder $(Cu)$ in the presence of the corresponding halogen acid ($HCl$ or $HBr$) is used to replace the diazonium group with a halogen atom.$4$. Therefore, the correct catalyst system is copper powder and $HCl$ or $HBr$.

In the Gattermann reaction, which of the following catalysts is used?

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