Coordination CompoundHard

Question

K6[(CN)5 CO - O - O - CO(CN)5] K5[(CN)5Co - O - O - Co(CN)5]
              (X)                                                                               (Y)
In both the complexes Co have t2g6eg0 configuration.
The bond energy of (O - O) in X and Y is :

Options

A.bond energy of (O - O) in Y <  bond energy of (O - O) in X.
B.bond energy of (O - O) in X <  bond energy of (O - O) in Y.
C.bond energy of (O - O) in X = bond energy of (O - O) in Y.
D.bond energy of (O - O) in X and bond energy of (O - O) in Y can′t be comparable.

Solution

K6[(CN-5)5 Co (III) - O - O - Co (III) (CN-5)5]6+ K5[(CN-5)5 Co - O-1 - Co(CN-5)5]5+.
O22- O2- ; bond order of O22- = = 1; bond order of O2- = = 1.5
Bond strength ∞ bond order ; so,
Bond energy of O22- < Bond energy of O2-.

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