1.

What is Rosenmund's reduction? What is the purpose of adding BaSO_(4) in it?

Answer»

Solution :(i) When reduced with hydrogen in the presence of 'poisoned' palladium catalyst, they form aldehydes. This reaction is called Rosenmund reduction.
`underset("Acetyl chloride")(CH_(3)-underset(O)underset(||)(C)-CL)+H-Hunderset(BaSO_(4))overset(Pd)tounderset("Acetaldehyde")(CH_(3)-underset(O)underset(||)(C)-H)+HCl`
(ii) `BaSO_(4)` is used as a catalytic poison to stop the reduction at the stage of aldehyde.
(iii) Otherwise, the aldehyde formed will be further reduced to primary alcohol.


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