Here 
A) promotes catalytic activity of Pd
B) removes the HCl formed in the reaction
C) deactivates palladium
D) activates palladium
Correct Answer: C
Solution :
In the Rosenmund's reaction, acid chlorides are converted to corresponding aldehydes by catalytic reduction. The reaction is carried out by passing through a hot solution of the acid chloride in the presence of Pd deposited over . Here, barium sulphate decrease the activity of palladium.
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