Question

what is the change of oxidation state of ir atom in vaska’s complex upon oxidative addition of oxygen molecule

Answer 1

Vaska's complex is a name that is given to the complex of iridium.

The complex of iridium is trans-carbonylchlorobis(triphenylphosphine)iridium(I), which has the formula IrCl(CO)[P(C₆H₅)₃]₂ .

The oxidation state of iron in this complex is +1.

Upon oxidative addition of oxygen , oxidation state of iron changes from +1 to +3.

that can be seen in the reaction given below:

IrCl(CO)[P(C₆H₅)₃]₂ + O₂-------> IrCl(CO)[P(C₆H₅)₃]₂O₂.