Question

Which of the following is a Gattermann aldehyde synthesis?

• A. A
• B. B
• C. C
• D. D

Hint:

Gattermann aldehyde synthesis: \(ArH + HCN + HCl \xrightarrow{AlCl_3/CuCl} Ar-CHO\) (after hydrolysis).

Answer 1

The Correct Option is C

Step 1: Recall Gattermann aldehyde synthesis.
Gattermann reaction converts aromatic compounds to aromatic aldehydes using:
\[ HCN + HCl \text{ in presence of } AlCl_3 / CuCl \] followed by hydrolysis.
Step 2: Identify correct option.
Option (C) matches the exact reagents: benzene + HCN + HCl with \(AlCl_3\) and then hydrolysis to benzaldehyde.
Step 3: Why other options are not Gattermann.
(A) is Rosenmund reduction.
(B) is Gattermann-Koch reaction (CO + HCl).
(D) is Etard reaction.
Final Answer: \[ \boxed{\text{Option (C)}} \]