Coordination Compounds - Result Question 11
####13. Which one of the following complexes is not expected to exhibit isomerism?
[2010]
(a) $[Ni(en)_3]^{2+}$
(b) $[Ni(NH_3)_4(H_2 O)_2]^{2+}$
(c) $[Pt(NH_3)_2 Cl_2]$
(d) $[Ni(NH_3)_2 Cl_2]$
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Solution:
(d) In $[Ni(NH_3)_2 Cl_2], Ni^{2+}$ is in $s p^{3}$
hybridisation, thus tetrahedral in shape. Hence, the four ligands are not different to exhibit optical isomerism. $\therefore$ Correct choice: (d)
(ii) [Mabcd] does not have a plane of symmetry, thus it will show optical isomerism. Whereas, $[Ma_2 b_2]$ has a plane of symmetry, thus it will show optical isomerism also.
Tetrahedral complexes are symmetrical in all directions. Thus, cannot show geometrical isomerism.
