During the Rosenmund reduction of acyl chlorides to aldehydes using gas over a Palladium catalyst, w — Aldehydes Ketones and Carboxylic Acids Chemistry Question

💡 Solution & Explanation

The highly active Palladium catalyst would normally reduce the acyl chloride past the aldehyde stage to a primary alcohol. $BaSO_4$ poisons the catalyst just enough to halt the reaction safely at the aldehyde.