Question

The reaction $Ar{N}_2^{+}{X}^{-}\stackrel{Cu/HCl}{\to }ArCl+N_2+CuX$ is named as

• A. Sandmeyer reaction
• B. Gattermann reaction
• C. Hoffmann bromamide degradation reaction
• D. Carbylamine reaction

Answer 1

The correct option is B Gattermann reaction

Sandmeyer reaction produces aryl halide in presence of $Cu\left(I\right)$ ion whereas Gattermann reaction is carried out in presence of $\text{Cu powder}/HX\left(\text{where X=Cl, Br}\right)$. The above reaction is Gattermann reaction.
In Hoffmann bromamide degradation, $CON{H}_2$ group is converted to $N{H}_2$ group.
In the Carbylamine reaction, $RNCor,PhNC$ is the product formed.
Hence, (b) is the correct option.