Question:
What is the product formed on Rosenmund reduction of benzoyl chloride ?
What is the product formed on Rosenmund reduction of benzoyl chloride ?
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Rosenmund reduction converts an acyl chloride to an aldehyde using H2 over Pd on BaSO4.
Updated On: Oct 1, 2026
- Benzene
- Benzyl alcohol
- Benzaldehyde
- Chlorobenzene
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The Correct Option is C
Solution and Explanation
Step 1: Understand the reaction
Rosenmund reduction is the catalytic hydrogenation of an acyl chloride to an aldehyde. The catalyst is palladium on barium sulphate, partly poisoned with sulphur or quinoline.
Step 2: Write the equation
\[ \text{C}_6\text{H}_5\text{COCl} + \text{H}_2 \xrightarrow{\text{Pd-BaSO}_4} \text{C}_6\text{H}_5\text{CHO} + \text{HCl} \]
Step 3: Why the reaction stops
The poisoned catalyst is not active enough to reduce the aldehyde further to the alcohol, so the reaction stops at the aldehyde stage.
Step 4: Check the options
Benzyl alcohol would form only with a stronger reducing agent, benzene needs removal of the whole acyl group and chlorobenzene needs a different reaction. So benzaldehyde is right.
Final Answer:
Benzoyl chloride gives benzaldehyde. This is option (C). \[ \boxed{\text{(C) }\text{Benzaldehyde}} \]
Rosenmund reduction is the catalytic hydrogenation of an acyl chloride to an aldehyde. The catalyst is palladium on barium sulphate, partly poisoned with sulphur or quinoline.
Step 2: Write the equation
\[ \text{C}_6\text{H}_5\text{COCl} + \text{H}_2 \xrightarrow{\text{Pd-BaSO}_4} \text{C}_6\text{H}_5\text{CHO} + \text{HCl} \]
Step 3: Why the reaction stops
The poisoned catalyst is not active enough to reduce the aldehyde further to the alcohol, so the reaction stops at the aldehyde stage.
Step 4: Check the options
Benzyl alcohol would form only with a stronger reducing agent, benzene needs removal of the whole acyl group and chlorobenzene needs a different reaction. So benzaldehyde is right.
Final Answer:
Benzoyl chloride gives benzaldehyde. This is option (C). \[ \boxed{\text{(C) }\text{Benzaldehyde}} \]
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