Question:
Which reagent is typically used in Rosenmund reduction to convert acyl chlorides to aldehydes?
Which reagent is typically used in Rosenmund reduction to convert acyl chlorides to aldehydes?
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Rosenmund Reduction converts:
Acyl chloride → Aldehyde
Reagent used:
\[
H_2 / Pd-BaSO_4
\]
The poisoned catalyst prevents further reduction to alcohol.
Updated On: Apr 22, 2026
- \(LiAlH_4\)
- \(H_2 / Pd - BaSO_4\)
- \(NaBH_4\)
- \(KMnO_4\)
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The Correct Option is B
Solution and Explanation
Concept:
Rosenmund Reduction is an organic reaction used to convert acid chlorides into aldehydes.
In this reaction:
• Hydrogen gas is used as the reducing agent.
• Palladium catalyst supported on \(\text{BaSO}_4\) is used.
• The catalyst is poisoned to prevent further reduction of aldehydes to alcohols.
Step 1: Write the Rosenmund reduction reaction. \[ RCOCl + H_2 \xrightarrow{Pd/BaSO_4} RCHO + HCl \]
Step 2: Identify the reagent used. The reagent required is \[ H_2 / Pd - BaSO_4 \]
Step 3: State the correct option. \[ \boxed{H_2 / Pd - BaSO_4} \]
• Hydrogen gas is used as the reducing agent.
• Palladium catalyst supported on \(\text{BaSO}_4\) is used.
• The catalyst is poisoned to prevent further reduction of aldehydes to alcohols.
Step 1: Write the Rosenmund reduction reaction. \[ RCOCl + H_2 \xrightarrow{Pd/BaSO_4} RCHO + HCl \]
Step 2: Identify the reagent used. The reagent required is \[ H_2 / Pd - BaSO_4 \]
Step 3: State the correct option. \[ \boxed{H_2 / Pd - BaSO_4} \]
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