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`RCOCl+ H_(2)overset(Pd//BaSO_(4)//S)toRCHO+HCl` In the above reaction (Rosenumed reduction),`BaSO_(4)//S` asts as:

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`RCOCl+ H_(2)overset(Pd//BaSO_(4)//S)toRCHO+HCl`
In the above reaction (Rosenumed reduction),`BaSO_(4)//S` asts as:
A. promoter for catalyst
B. poison for catalyst
C. only catalyst
D. d
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Correct Answer - B
Sulphur (S) poisons the catalyst Pd deposited over `BaSO_(4).` Its effecency and cannot carry the reducton of aldehyde to primary alcohol.
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