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Rationalize the following trend in rate constants (kobs) for the reaction below: Pt(PX3)3Cl + pyridine →...

  1. Rationalize the following trend in rate constants (kobs) for the reaction below:

Pt(PX3)3Cl + pyridine → Pt(PX3)3(pyridine) + Cl-

X = phenyl, kobs = 0.08

X = o-tolyl, kobs = 0.0002

X = mesityl, kobs = 0.000001  

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