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AIIMS2018Chemistry-Coordination Compounds

AIIMS 2018 Chemistry Isomerism MCQ Question

Type: MCQ-conceptual-Hard-Class 12

The correct statement on the isomerism associated with the following complex ions,

A. [Ni(H2O)5NH3]2+[\text{Ni}(\text{H}_2\text{O})_5 \text{NH}_3]^{2+}

B. [Ni(H2O)4(NH3)2]2+[\text{Ni}(\text{H}_2\text{O})_4(\text{NH}_3)_2]^{2+} and

C. [Ni(H2O)3(NH3)3]2+[\text{Ni}(\text{H}_2\text{O})_3(\text{NH}_3)_3]^{2+} is:

A

(A) and (B) show only geometrical isomerism.

B

(A) and (B) show geometrical and optical isomerism.

C

(B) and (C) show geometrical and optical isomerism.

D

(B) and (C) show only geometrical isomerism.

Correct Answer

Option A

Detailed Explanation

Cis-[Ni(H₂O)₄(NH₃)₂]²⁺ exhibits optical isomerism due to its non-superimposable mirror images, which arise from the arrangement of ligands around the nickel center, creating chiral complexes. In contrast, facial [Ni(H₂O)₃(NH₃)₃]²⁺ does not show optical isomerism because its symmetrical arrangement allows for superimposable mirror images, lacking chirality. Understanding these concepts is crucial for recognizing how ligand arrangements influence the optical properties of coordination compounds.

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