Question

23 multiple choice 2 points which catalyst is typically used in the hydrogenation of alkenes? kmno₄ fecl₃ pd or pt h₂so₄

Explanation:

• \(KMnO_4\): It is an oxidizing agent. It is used in oxidation reactions (like oxidation of alkenes to di - alcohols or carboxylic acids depending on the conditions), not in hydrogenation.
• \(FeCl_3\): It is a Lewis acid catalyst. It is commonly used in electrophilic substitution reactions (e.g., Friedel - Crafts reactions), not in hydrogenation of alkenes.
• \(Pd\) or \(Pt\): These are noble metal catalysts. In the hydrogenation of alkenes (\(C = C+\ H_2

ightarrow C - C\)), \(Pd\) (palladium) or \(Pt\) (platinum) are used. The metal provides a surface for the adsorption of \(H_2\) and the alkene, facilitating the addition of hydrogen across the double bond.

• \(H_2SO_4\): It is a strong acid. It can be used in acid - catalyzed hydration of alkenes (\(C = C+\ H_2O

ightarrow C - C - OH\)) or in other acid - catalyzed reactions (like esterification), but not in hydrogenation.

Answer:

C. Pd or Pt