Draw the structures of geometrical isomers of the following coordination complexes:
[Co(NH₃)₃Cl₃] and [CoCl₂(en)₂⁺]
(en = ethylene diamine and atomic number of Co is 27).   

226. A metal ion Mⁿ⁺ having d⁴ valence electronic configuration combines with three didendate ligands to form complex compound. Assuming ∧₀ > P.

(i)  Draw the diagram showing d-orbital splitting during this complex formation.
(ii) Write the electronic configuration of the valence electrons of the metal Mⁿ⁺ in terms to t_2g, and e_g .

(iii) What type of hybridisation will Mⁿ⁺ ion have?

(iv) Name the type of isomerism exhibited by this complex.

Illustrate with an example of the following:
Linkage isomerism

(i) Explain geometrical isomerism with reference to square planar complexes giving one example. How is tetrahedral complexes with simple ligands do not exhibit geometrical isomerism?
(ii)    Using valence bond theory, predict the shape and magnetism (paramagnetism) or diamagnetism of [Co(CO)₄]^– (at. no. of Co = 27)?
(iii)    How is stability of coordination compounds determined in aqueous solution?