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Question

In which of the following octahedral complexes of Co (Z = 27) will the magnitude of Δ0 be the highest?

A
[Co(NH3)6]3+
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B
[Co(CN)6]3
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C
[Co(C2O4)3]3
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D
[Co(H2O)6]3+
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Solution

The correct option is B [Co(CN)6]3

The spectrochemical series is given below:

I < Br < S2− < SCN < Cl < NO3 < N3 < F < OH < C2O42− < H2O < NCS < CH3CN < py < NH3

< en < bipy < phen < NO2 < PPh3 < CN < CO

CN is the strongest of all the ligands given in the options, and hence, Δ0 is highest for [Co(CN)6]3.

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