Question

What is the product formed on Rosenmund reduction of benzoyl chloride ?

• A. Benzene
• B. Benzyl alcohol
• C. Benzaldehyde
• D. Chlorobenzene

Hint:

Rosenmund reduction converts an acyl chloride to an aldehyde using H2 over Pd on BaSO4.

Answer 1

The Correct Option is C

Step 1: Name reaction
Rosenmund: $\text{RCOCl} \to \text{RCHO}$.

Step 2: Apply
R is the phenyl group, so the aldehyde is $\text{C}_6\text{H}_5\text{CHO}$.

Step 3: Role of the poison
Barium sulphate and the poison lower the catalyst activity so that over-reduction to benzyl alcohol is prevented.

Step 4: Answer
Benzaldehyde, option (C).

Final Answer:
The product is benzaldehyde. This is option (C). \[ \boxed{\text{(C) }\text{Benzaldehyde}} \]