The complex that shows Facial - Meridional isomerism is:

The complex that shows Facial - Meridional isomerism is:
  1. $\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+}$
  2. $\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+}$
  3. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]$
  4. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+}$

Solution

$\mathrm{Ma}_3 \mathrm{~b}_3$ type complexes show Facial - Meridional isomerism
(i) $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right] \Rightarrow \mathrm{Ma}_3 \mathrm{~b}_3$
(ii) $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+} \Rightarrow \mathrm{Ma}_4 \mathrm{~b}_2$
(iii) $\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+} \Rightarrow \mathrm{M}(\mathrm{AA})_3$
(iv) $\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+} \Rightarrow \mathrm{M}(\mathrm{AA})_2 \mathrm{~b}_2$
$\mathrm{a}, \mathrm{b},=\mathrm{NH}_3, \mathrm{Cl}^{-}$
$\mathrm{AA}=\mathrm{en}$

Asked in: JEE Main 2025 (23 Jan Shift 1)

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