Indicate the complex/complex ion which did not show any geometrical isomerism :

1. ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4{\mathrm{Cl}}_2\right]}^{+}$
2. $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_3{\left({\mathrm{NO}}_2\right)}_3\right]$
3. ${\left[\mathrm{Co}\left(\mathrm{CN}{)}_5\right(\mathrm{NC})\right]}^{3-}$
4. $\left[{\mathrm{CoCl}}_2(\mathrm{en}{)}_2\right]$

Solution

Asked in: JEE Main 2021 (26 Aug Shift 2)

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