Question

In Gattermann reaction, a diazonium group is replaced by \(X\) using \(Y\). \(X\) and \(Y\) are

• A. \(Cl\) ; \(CuCl/HCl\)
• B. \(Cl\) ; \(CuCl_2/HCl\)
• C. \(Cl\) ; \(Cu_2O/HCl\)
• D. \(I\) ; \(Cu_2O/HCl\)

Hint:

Gattermann reaction: \(ArN_2^+\) is replaced by \(Cl/Br\) using \(CuX\) and \(HX\).

Answer 1

The Correct Option is A

Step 1: Recall Gattermann reaction.
Gattermann reaction replaces diazonium group \((-N_2^+)\) with halogen using copper powder and HX.
Step 2: For chlorine substitution.
When \(Cl\) is introduced, reagent used is:
\[ CuCl/HCl \]
Step 3: Identify correct pair.
Thus:
\[ X = Cl,\quad Y = CuCl/HCl \]
Final Answer:
\[ \boxed{Cl;\;CuCl/HCl} \]