The reaction of trans-IrCl(CO)(PPh3)2 with tetrafluoroethylene gives a product in which the PPh3 ligands are cis to each other, and CO and Cl ligands are trans to each other.

(a) Provide a reaction scheme that illustrates this, and include the structure of the reactant and product in your answer. What is the oxidation state of the Ir metal centre in the reactant and product complexes?

(b) In the 19F NMR spectrum of the reaction product, two distinct resonances are observed. Explain this observation.