7. Propose a mechanism for the following substitution reaction: -NO₂ PPh3 Rh -NO₂ Ос CO OC PPh 3 Your mechanism must be consistent with the following three observations: 1) Using excess

PPh3, the rate is first order in rhodium complex 2) Plots of kobs Vs. [PPh3] are linear with a zero intercept 3) AS-17.9 kJ/mol

Fig: 1