Question: Which one of the following complex ions has geometrical isomers ?
$\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}$
$\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Br}\right]^{+}$
$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{2}(\mathrm{en})_{2}\right]^{3+}$
$\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{4}(\mathrm{en})\right]^{3+}$
Correct Option: , 3
Solution:
Solution not required
