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problem 1: Suggest a plausible mechanism for the following reaction:

2343_plausible mechanism.jpg

problem 2: Why are electrophilic additions involving H+ often mechanistically complex?
 
problem 3: Addition of H2 to Cp2Sc-Me generates Cp2Sc-H and CH4. What is the probable mechanism?

problem 4: The following reactions have been shown to proceed through different mechanisms:

1132_stereochemistry mechanism.jpg

Predict products A and B, including stereochemistry, and present a reasonable mechanism for each reaction.

problem 5: For the pairs of complexes given below, predict which one will be more reactive towards oxidative addition of H2.
 
a) RhCl(PPh3)3 or RhCl(CO)(PPh3)2

b) IrCl(CO)(PPh3)2 or [PtCl(CO)(PPh3)2]+

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