Question

The reaction 

• A. Rosenmund's reaction
• B. Stephen's reaction
• C. Cannizzaro's reaction
• D. Gattermann-Koch reaction

Hint:

The Gattermann-Koch reaction is a formylation reaction where benzene reacts with carbon monoxide (\( \text{CO} \)) and hydrochloric acid (\( \text{HCl} \)) in the presence of \(\text{AlCl}_3\) or \(\text{CuCl}\) to form benzaldehyde.

Answer 1

The Correct Option is D

Step 1: Understanding the Reaction Mechanism 
The given reaction involves the formation of benzaldehyde from benzene using carbon monoxide (\( \text{CO} \)) and hydrochloric acid (\( \text{HCl} \)) in the presence of anhydrous aluminum chloride (\( \text{AlCl}_3 \)) or cuprous chloride (\( \text{CuCl} \)). 
Step 2: Identifying the Correct Name 
This reaction is known as the Gattermann-Koch reaction and is used to synthesize benzaldehyde from benzene. 
Step 3: Eliminating Incorrect Options 
- Rosenmund’s reaction involves the reduction of acyl chlorides to aldehydes, which is not applicable here. 
- Stephen’s reaction is the partial reduction of nitriles to imines, followed by hydrolysis to form aldehydes. 
- Cannizzaro’s reaction is a redox reaction involving the disproportionation of aldehydes without alpha-hydrogen atoms. Thus, the correct answer is Gattermann-Koch reaction. 

Final Answer: The reaction shown follows the Gattermann-Koch reaction.