Elaidic (“EL-ay-id-ick”) acid undergoes this reaction to form stearic acid. A catalyst commonly used for this reaction consists of three (10[1])triphenylphosphine (“tri-FEN-ill-FOSS-fene”) groups bonded to a rhodium atom and is named for (10[1])Wilkinson. This reaction is performed in a “syn-” (“sin”) fashion on a palladium or platinum catalyst. (-5[1])Due to isomerization, this reaction may introduce trans byproducts while making products less prone to auto-oxidation and more solid at room temperature. This type of addition reaction is used to produce margarine by reducing alkenes to saturated (10[1]-5[1])alkanes. For 10 points, name this reaction in which a molecule gains two atoms (-5[1])of the lightest element. ■END■ (10[5]0[2])