For the formation of [Co X (NH 3 ) 5 ] 2+ from [Co(NH 3 ) 5 (OH 2 )] 3+ the rate constants differ by no more than a factor of two, where X = Cl – ,…

For the formation of [CoX(NH3)5]2+ from [Co(NH3)5(OH2)]3+ the rate constants differ by no more than a factor of two, where X = Cl-, Br-, N3-, and SCN-. What does this suggest about the mechanism?