Tafel Analysis Two-Electron Processes

In cases where the voltammetry of a two-electron process exhibits a single reductive wave (Ef /B , B/c) what gradient would be obtained from a Tafel plot (In i vs E) in each of the following cases  

Comment on your answers, highlighting why these are useful results for the mechanistic analysis of electrochemical systems. 

If the transfer coefficients (ai, Pi) and (ct2, Pz) refer to the one-electron transfers from A to B and B to C , respectively, the fluxes of all three species can be written 

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