The rate law for the hydrogenation (H) of ethylene (E) to form ethane (A) over a cobalt-mo...

The rate law for the hydrogenation (H) of ethylene (E) to form ethane (A) over a cobalt-molybdenum catalyst [Collection Czech. Chem. Commun , 51,  2760 (1988)] is

(a) Suggest a mechanism and rate-limiting step consistent with the rate law.

(b) What was the most difficult part in finding the mechanism?

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(c) The formation of propanol on a catalytic surface is believed to proceed by the following mechanism.