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4. (50 pts) The following reaction involving a Ni complex has been proposed in a Ni-catalyzed hydrosilylation reaction of alkene. IMes is a neutral carbene ligand shown. iii a. (10 pts) IMes, an N-heterocyclic carbene ligand, is a s'rong donor and a strong acceptor. Explain why this is the case. rus Pcecf, b. (10 pts) Determine the oxidation state and valence electron count of Ni for the five Ni-containing species. c. (20 pts) Classify the nature of the reactions in the steps (labelled i-v) involved in the catalytic cycle, and briefly describe what is happening in each step. a. (10 pts) The activation parameters of the reaction have been obtained by Eyring plot: H=20.40.2kcalmol1,S=0.280.2calmol1K1. Based on these data, which of the above steps is likely to be the rate determining step? 4. (50 pts) The following reaction involving a Ni complex has been proposed in a Ni-catalyzed hydrosilylation reaction of alkene. IMes is a neutral carbene ligand shown. iii a. (10 pts) IMes, an N-heterocyclic carbene ligand, is a s'rong donor and a strong acceptor. Explain why this is the case. rus Pcecf, b. (10 pts) Determine the oxidation state and valence electron count of Ni for the five Ni-containing species. c. (20 pts) Classify the nature of the reactions in the steps (labelled i-v) involved in the catalytic cycle, and briefly describe what is happening in each step. a. (10 pts) The activation parameters of the reaction have been obtained by Eyring plot: H=20.40.2kcalmol1,S=0.280.2calmol1K1. Based on these data, which of the above steps is likely to be the rate determining step