Question

Select the incorrect statement regarding the given reaction.

$RCOCl+H_2\stackrel{Pd-BaS{O}_4}{\to }RCHO+HCl$

• A. $Pd$ acts as a positive catalyst.
• B. It is Rosenmund reaction.
• C. $BaS{O}_4$ acts as poison for $Pd$.
• D. $BaS{O}_4$ acts as promoter for $Pd$.

Answer 1

The correct option is D $BaS{O}_4$ acts as promoter for $Pd$.

The Rosenmund reaction is catalyzed by palladium on barium sulphate. Barium sulphate reduces the activity of palladium due to its low surface area meaning it decreases the reducing power of palladium in order to prevent over-reduction of the acid.

So, $BaS{O}_4$ acts as a poison for Pd, not as a promoter for Pd

So, D is here correct answer