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