Which one of the following complexes is not expected to exhibit isomerism?

Which one of the following complexes is not expected to exhibit isomerism?
  1. $\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_4\left(\mathrm{H}_2 \mathrm{O}\right)_2\right]^{2+}$
  2. $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_2\right]$
  3. $\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_2\right]$
  4. $\left[\mathrm{Ni}(\mathrm{en})_3\right]^{2+}$

Solution

$\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_2\right]$ has tetrahedral geometry and thus, does not exhibit isomerism due to presence of symmetry elements.

Asked in: NEET 2010 (Mains)

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