Which of the following is true for the complex $\mathrm{Co}\left({\mathrm{NO}}_2\right)(\mathrm{Cl}{)}_2\cdot 5{\mathrm{NH}}_3$( Co is in+ III oxidation state)?

 

$\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left({\mathrm{NO}}_2\right)\right]{\mathrm{Cl}}_2$ and $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\mathrm{Cl}\right]\mathrm{Cl}\left({\mathrm{NO}}_2\right)$ are ionisation isomers.

$\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left({\mathrm{NO}}_2\right)\right]{\mathrm{Cl}}_2$ and $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left(\mathrm{ONO}\right)\right]{\mathrm{Cl}}_2$ are linkage isomers.

The $3{\mathrm{d}}^6$ structure of cobalt in the +3 oxidation state has a higher CFSE. The complex is hence diamagnetic and in the inner orbital state (i.e.${\mathrm{d}}^2{\mathrm{sp}}^3$hybridisation).

Thus, all options are true for the given complex.