Question:
Which of the following is obtained by hydrogenation of benzoyl chloride in presence of Pd on BaSO\(_4\)?
Which of the following is obtained by hydrogenation of benzoyl chloride in presence of Pd on BaSO\(_4\)?
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Rosenmund reduction converts acid chlorides selectively into aldehydes using a poisoned catalyst.
Updated On: Jan 30, 2026
- Benzene
- Benzoic acid
- Benzyl alcohol
- Benzaldehyde
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The Correct Option is D
Solution and Explanation
Step 1: Identify the reaction.
Hydrogenation of acid chlorides in the presence of \(\text{Pd/BaSO}_4\) is known as the Rosenmund reduction.
Step 2: Apply Rosenmund reduction.
In this reaction, an acid chloride is selectively reduced to an aldehyde without further reduction to alcohol.
Step 3: Reaction involved.
\[ \text{C}_6\text{H}_5\text{COCl} \xrightarrow[\text{Pd/BaSO}_4]{\text{H}_2} \text{C}_6\text{H}_5\text{CHO} \]
Step 4: Analyze options.
(A) Benzene is not formed in this reaction.
(B) Benzoic acid is not a reduction product.
(C) Benzyl alcohol is not formed due to poisoned catalyst.
(D) Benzaldehyde is the correct product.
Step 5: Conclusion.
Benzaldehyde is obtained by hydrogenation of benzoyl chloride using Pd on BaSO\(_4\).
Hydrogenation of acid chlorides in the presence of \(\text{Pd/BaSO}_4\) is known as the Rosenmund reduction.
Step 2: Apply Rosenmund reduction.
In this reaction, an acid chloride is selectively reduced to an aldehyde without further reduction to alcohol.
Step 3: Reaction involved.
\[ \text{C}_6\text{H}_5\text{COCl} \xrightarrow[\text{Pd/BaSO}_4]{\text{H}_2} \text{C}_6\text{H}_5\text{CHO} \]
Step 4: Analyze options.
(A) Benzene is not formed in this reaction.
(B) Benzoic acid is not a reduction product.
(C) Benzyl alcohol is not formed due to poisoned catalyst.
(D) Benzaldehyde is the correct product.
Step 5: Conclusion.
Benzaldehyde is obtained by hydrogenation of benzoyl chloride using Pd on BaSO\(_4\).
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