Explain the following giving an exmaple in each case:
(i) Linkage isomersion.
(ii) An outer orbital complex .
. (iii) A bidentate ligand.

Explanation

(i) Linkage isomerism: This type of the isomerism arises due to the presence of an ambidentae Ligand in a coordination compound e.g., `[Co(NH_(3))_(5) NO_(2)]Cl_(2)`.
(ii) An outer orbital complex. When ns,np and nd orbitals are involved in hybridistaion, outer orbital complex is formed e.g., `[CoF_(6)]^(2-)`
(iii) Bidentate ligand : When a Ligand is bound to a metal ion thorugh two donor atoms it is said to be didentate ligand,. e.g., `H_(2)N-CH_(2)-CH_(2)-NH_(2)`.