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The catalyst used in Rosenmund's reduction is:

1. HgSO4
2. Pd/BaSO4
3. anhydrous AlCl3
4. anhydrous ZnCl2

Correct answer: Pd/BaSO4

Solution

Rosenmund's reduction involves the reduction of acid chlorides to aldehydes using hydrogen gas in the presence of palladium (Pd) supported on barium sulfate (BaSO4) as a catalyst.

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