Question

1 multiple answer 2 points which reagents are used in the catalytic hydrogenation of alkenes? oso4 kmno4 pt catalyst h2 gas

Explanation:

• $\ce{OsO4}$ (osmium tetroxide) is used in dihydroxylation reactions (adding two hydroxyl groups to an alkene), not in catalytic hydrogenation.
• $\ce{KMnO4}$ (potassium permanganate) is used in oxidation reactions of alkenes (like forming diols or carboxylic acids depending on conditions), not in catalytic hydrogenation.
• A $\ce{Pt}$ (platinum) catalyst is commonly used in catalytic hydrogenation of alkenes. It helps in the addition of $\ce{H2}$ (hydrogen gas) to the alkene double - bond.
• $\ce{H2}$ gas is the source of hydrogen atoms that add across the alkene double - bond in catalytic hydrogenation.

Answer:

C. Pt catalyst, D. H₂ gas