Number of bridging $\mathrm{CO}$ ligands in $\left[{\mathrm{Mn}}_2{\left(\mathrm{CO}\right)}_{10}\right]$ is             

Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value.

Complexes: $\begin{array}{cccc}\underset{\mathrm{A}}{{\left[{\mathrm{CoF}}_6\right]}^{3-}},& \underset{\mathrm{B}}{{\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}},& \underset{\mathrm{C}}{{\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}}\text{ and }\underset{\mathrm{D}}{{\left[\mathrm{Co}(\mathrm{en}{)}_3\right]}^{3+}}& \end{array}$

Choose the correct option :

In which of the following order the given complex ions are arranged correctly with respect to their decreasing spin only magnetic moment?
(i) ${\left[{\mathrm{FeF}}_6\right]}^{3-}$

(ii) ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$

(iii) ${\left[{\mathrm{NiCl}}_4\right]}^{2-}$

(iv) ${\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]}^{2+}$