In Rosenmund reduction, which of the following poison the catalyst Pd?
A
BaSO4
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B
S
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C
Quinoline
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D
Xylene
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Solution
The correct option is ABaSO4 The Rosenmund reduction is a hydrogenation process in which an acyl chloride is selectively reduced to an aldehyde. The reaction is catalysed by palladium on barium sulfate, which is sometimes called the Rosenmund catalyst. Barium sulfate has a low surface area which reduces the activity of the palladium, preventing over-reduction.