12) The catalytic hydrogenation of ethylene can occur by the following two-step mechanism: Step 1: Pd + H2 - Ран2 Step 2: PdH2 + С2н4 — Рӑ + С2Н6 Which species is an intermediate in this mechanism? A) H2 в) Ран2 C) C2H4 D) C2H6

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