Which one of the following complex ions

Question:

Which one of the following complex ions has geometrical isomers ?

  1. $\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}$

  2. $\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Br}\right]^{+}$

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

  4. $\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{4}(\mathrm{en})\right]^{3+}$


Correct Option: , 3

Solution:

Solution not required

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