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The one that is not expected to show isomerism is:

(1) [Ni(NH3)2Cl2

(2) [Ni(NH3)4(H2O)2]2+

(3) [Ni(en)3]2+

(4) [Pt(NH3)2Cl2]

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Ans. (1) [Ni(NH3)2Cl2]

Sol. (1) [Ni(NH3)2Cl2] $\implies$ Ni2+ $\implies$ 3d84s0.

$\implies$ sp3 hybridisation.

$\implies$ tetrahedral.

so [Ni(NH3)2Cl2] do not show isomerism.

(2) [Ni(NH3)4(H2O)2]2+, show geometrical isomerism.

(3) [Ni(en)3]2+, show optical isomerism.

(4) [Pt(NH3)2Cl2], show geometrical isomerism.

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