1.

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_(2)O_(4))_(3)]^(3-) (iv) [CoF_(6)]^(3-)

Answer»

Solution :(i) `[Fe(CN)_(6)]^(4-)-d^(2)sp^(3)`, octahedral, diamagnetic.
(ii) `[FeF_(6)]^(3-)-sp^(3)d^(2)`, octahedral, PARAMAGNETIC (similar to `[CoF_(6)]^(3-)`)
(iii) `[Co(C_(2)O_(4))_(3)]^(3-)-d^(2)sp^(3)`, octahedral, diamagnetic.
(iv) `[CoF_(6)]^(3-)-sp^(3)d^(2)`, octahedral, paramagnetic.


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