\nHydrogenation is a chemical reaction between molecular hydrogen ($\\text{H}_2$) and another compound, usually in the presence of a catalyst. Hydrogenation of alkenes involves adding hydrogen across the carbon-carbon double bond, converting the alkene into a saturated alkane. This reaction typically requires a catalyst to lower the activation energy, as the $\\text{H-H}$ bond in hydrogen is strong.
\nCommon catalysts used for the hydrogenation of alkenes are transition metals, particularly from Group 8, 9, and 10 of the periodic table. These metals, such as platinum ($\\text{Pt}$), palladium ($\\text{Pd}$), rhodium ($\\text{Rh}$), and nickel ($\\text{Ni}$), adsorb both the alkene and hydrogen molecules onto their surface, facilitating the reaction.<\/p>\nLooking at the options provided:
\nA) Copper: Copper can catalyze some hydrogenation reactions, but it is generally less active than Ni, Pt, or Pd for alkene hydrogenation.
\nB) Zinc: Zinc is not a typical catalyst for the hydrogenation of alkenes.
\nC) Aluminium: Aluminium is not used as a catalyst for the hydrogenation of alkenes; it is a reactive metal itself.
\nD) Nickel: Nickel is a very common and widely used catalyst for the hydrogenation of alkenes, especially in industrial processes (e.g., hydrogenation of vegetable oils to margarine – the Sabatier-Senderens process often uses Ni).<\/p>\n
Therefore, nickel is a standard catalyst for the hydrogenation of alkenes.
\n<\/section>\n\n– Hydrogenation of alkenes is the addition of H\u2082 to the double bond.
\n– This reaction requires a catalyst.
\n– Transition metals like Ni, Pt, Pd, and Rh are common hydrogenation catalysts.
\n– Nickel is a common and cost-effective catalyst for alkene hydrogenation.
\n<\/section>\n