Identify the complex among the following that is not expected to exhibit isomerism:

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Accepted Answer

1. $[Pt(NH_3)_2Cl_2]$ is a square planar complex of the type $[MA_2B_2]$ and exhibits geometrical isomerism (cis and trans forms). 
2. $[Ni(en)_3]^{2+}$ is an octahedral complex containing bidentate ligands of the type $[M(AA)_3]^{n+}$ and exhibits optical isomerism (dextro and laevo forms). 
3. $[Ni(NH_3)_4(H_2O)_2]^{2+}$ is an octahedral complex of the type $[MA_4B_2]$ and exhibits geometrical isomerism (cis and trans forms). 
4. $[Ni(NH_3)_2Cl_2]$ is a tetrahedral complex. Tetrahedral complexes do not show geometrical isomerism because the relative positions of the unidentate ligands attached to the central metal atom are the same with respect to each other. Furthermore, since all four ligands are not different, it also does not show optical isomerism. Therefore, it is not expected to exhibit isomerism.

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