12) The catalytic hydrogenation of ethylene can occur by the following two-step mechanism: Step 1: Pd + H2 → PDH2 Step 2: PdH2 + C2H4 – Pd + C2H6 Which species is an intermediate in this mechanism? A) Н2 B) PDH2 C) C2H4 D) C2H6 13) Which species is a catalyst in the mechanism in #12? A) Н2 B) PDH2 C) C2H4 D) C2H6 E) Pd

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