The correct trend of rate of electron transfer reaction between the complexes [CoC NH3),5X]2+/ [Co(H2O)6]2+with variation of X isa)Cl-

Question

The correct trend of rate of electron transfer reaction between the complexes [CoC NH3),5X]2+/ [Co(H2O)6]2+with variation of X isa)Cl- < Br- < SO42-b)Br- < Cl- < SO42-c)SO42- < Cl- < Br-d)SO42- < Br-< CI-Correct answer is option 'C'. Can you explain this answer?

Answer

The correct trend of rate of electron transfer reaction between the complexes [Co(NH3)5X]2- / [Co(H2O)6]2+ with variation of X is:

a) Cl- > Br- > I-

This is because the rate of electron transfer in a redox reaction depends on the strength of the oxidizing and reducing agents involved. In this case, the [Co(NH3)5X]2- complex is the oxidizing agent, while the [Co(H2O)6]2+ complex is the reducing agent.

As we move down the halogen group, the electronegativity and size of the halogen atoms increase. This results in a decrease in the strength of the Co-X bond and an increase in the stability of the [Co(NH3)5X]2- complex. Therefore, the rate of electron transfer increases as we move from I- to Cl-.

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