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The rate constants for the formation of [CoX(NH3)5] 2+ from [Co(NH3)5OH2] 3+ for X = Cl‐...

The rate constants for the formation of [CoX(NH3)5] 2+ from [Co(NH3)5OH2] 3+ for X = Cl‐ , Br‐ , N3 ‐ , and SCN‐ differ by no more than a factor of 2. What is the mechanism of substitution?

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