Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory:
(i). `[Fe(CN)_6]^(4-)`
(ii). `[FeF_6]^(3-)`
(iii). `[Co(C_2O_4)_3]^(3-)`
(iv). `[CoF_6]^(3-)`

Explanation

(i) `[Fe(CN)_(6)]^(4-)is a^(2)sp^(3)` hybridised octahedral in shape and diamagnetic in nature




(ii) `[FeF_(6)]^(3-)is sp^(3)a^(2)` hybridised octahedral in shape and paramganetic in nature
(iii) `[Co(C_(2)O_(4))_(3)]^(3-) is a^(2)sp^(3)` hybridised octahedral in shape and diamagnetic in nature
(iv) `[CoF_(6)]^(3-) is sp^(3)d^(2)` hybridised octahedral in shape and paramagnetic in nature.