Give the electronic configuration of the following complexes on the basis of the crystal field splitting theory: ${\left[{\mathrm{CoF}}_6\right]}^{3-}, {\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{4-}$ and ${\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_6\right]}^{2+}$

Using valence bond theory, explain the following in relation to the complexes given below:
$\left[\mathrm{Co}\right({\mathrm{NH}}_3{)}_6{]}^{3+}$

(i) Type of hybridisation.
(ii) Inner or outer orbital complex.
(iii) Magnetic behaviour.
(iv) Spin only magnetic moment value.

${\mathrm{CoSO}}_4\mathrm{Cl}.5{\mathrm{NH}}_3$ exists in two isomeric forms $‘\mathrm{A}’$ and $‘\mathrm{B}’$. Isomer $‘\mathrm{A}’$ reacts with ${\mathrm{AgNO}}_3$ to give white precipitate, but does not react with ${\mathrm{BaCl}}_2$. Isomer $‘\mathrm{B}’$ gives white precipitate with ${\mathrm{BaCl}}_2$ but does not react with ${\mathrm{AgNO}}_3$. Answer the following questions. 

(i) Identify$\text{'}\mathrm{A}\text{'}$and $\text{'}\mathrm{B}\text{'}$ and write their structural formulas. 

(ii) Name the type of isomerism involved. 

(iii) Give the $\mathrm{IUPAC}$ name of $‘\mathrm{A}’$ and $‘\mathrm{B}’$.