The IUPAC name of $$\mathrm{K}_{3}\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]$$ is:-

Given below are two statements, one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$.

Assertion A: The spin only magnetic moment value for $$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$$ is $$1.74 \mathrm{BM}$$, whereas for $$\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$$ is $$5.92 \mathrm{BM}$$.

Reason $$\mathbf{R}$$ : In both complexes, $$\mathrm{Fe}$$ is present in +3 oxidation state.

In the light of the above statements, choose the correct answer from the options given below:

The complex cation which has two isomers is :

Which of the following complex will show largest splitting of d-orbitals?