Which of the metal is used in catalytic hydrogenation?

Ni

The correct answer is Option (2) → Ni

Core Concept

Catalytic hydrogenation involves addition of hydrogen in presence of a metal catalyst.

Common catalysts:

Ni, Pd, Pt

Explanation of Each Option

Cadmium (Cd) is not used as a hydrogenation catalyst because it does not efficiently adsorb hydrogen or activate the double bond for addition.

Nickel (Ni), especially Raney Nickel, is widely used in catalytic hydrogenation of alkenes, alkynes, and oils due to its excellent ability to adsorb hydrogen and facilitate its addition to unsaturated compounds.

Iron (Fe) is generally used in Haber process and not for catalytic hydrogenation of organic compounds.

Cobalt (Co) is used in Fischer–Tropsch synthesis but not typically for hydrogenation of organic double bonds.