(A) The Gattermann reaction involves the substitution of the diazonium group $(-N_{2}^{+})$ in an arene diazonium salt with a halogen ($-Cl$ or $-Br$)

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$ArN_{2}^{+}X^{-} \xrightarrow{Cu/HCl} ArCl + N_{2} \uparrow$

(A) The Gattermann reaction involves the substitution of the diazonium group $(-N_{2}^{+})$ in an arene diazonium salt with a halogen ($-Cl$ or $-Br$) using copper powder and the corresponding halogen acid ($HCl$ or $HBr$).Option $(A)$ represents the Gattermann reaction.Option $(C)$ represents the Sandmeyer reaction, as it uses cuprous halide $(Cu_{2}Br_{2})$ with $HBr$.

Class 12 Chemistry Haloalkanes and Haloarenes Preparation of Haloarenes

Medium

Which of the following reactions represents the Gattermann reaction?

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A
$ArN_{2}^{+}X^{-} \xrightarrow{Cu/HCl} ArCl + N_{2} \uparrow$
B
$ArN_{2}^{+}X^{-} \xrightarrow{HBF_{4}} ArN_{2}^{+}BF_{4}^{-} \xrightarrow{\Delta} ArF + N_{2} \uparrow + BF_{3}$
C
$ArN_{2}^{+}X^{-} \xrightarrow{Cu_{2}Br_{2}/HBr} ArBr + N_{2} \uparrow$
D
$ArN_{2}^{+}X^{-} \xrightarrow{KI, \Delta} ArI + N_{2} \uparrow + KX$