## Question

###### ProblemAn ECE mechanism is similar to that in Problem 7.3, except the product of the chemical step is electroactive and is able to undergo further electrontransfer: An example of this is found with the reduction of p-chlorobenzonitrile (CI-CHy-CN) which is able to undergo the following mechanism:Cl-C6H4-CN + e = Cl-CoH4-CN Cl-CoHy-CN" +H 4 CbHs-CN + Cl- C6Hs-CN + e = CsHs-CN"E? = -1.96 VE7 = -2.32Vwhere H: is abstracted from the solvent: The chemical step is highly thermody- namicall

Problem An ECE mechanism is similar to that in Problem 7.3, except the product of the chemical step is electroactive and is able to undergo further electron transfer: An example of this is found with the reduction of p-chlorobenzonitrile (CI-CHy-CN) which is able to undergo the following mechanism: Cl-C6H4-CN + e = Cl-CoH4-CN Cl-CoHy-CN" +H 4 CbHs-CN + Cl- C6Hs-CN + e = CsHs-CN" E? = -1.96 V E7 = -2.32V where H: is abstracted from the solvent: The chemical step is highly thermody- namically driven and its kinetics are fast: Sketch the voltammetry for the reduction of Cl-CbH4-CN at high; medium and low scan rates (relative to the rate of the chemical step).

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