Which one of the following metal

Question:

Which one of the following metal complexes is most stable?

  1. $\left[\mathrm{Co}(\mathrm{en})\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{Cl}_{2}$

  2. $\left[\mathrm{Co}(\mathrm{en})_{3}\right] \mathrm{Cl}_{2}$

  3. $\left[\mathrm{Co}(\mathrm{en})_{2}\left(\mathrm{NH}_{3}\right)_{2}\right] \mathrm{Cl}_{2}$

  4. $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{2}$

Correct Option: , 2

Solution:

Complex $\left[\mathrm{Co}(\mathrm{en})_{3}\right] \mathrm{Cl}_{2}$ is most stable complex among the given complex compounds because more number of chelate rings are present in this complex as compare to others.

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