COMEDK · Chemistry · 24. Coordination Compounds

Which one of the following complex-isomerism pair matches correctly?

A \([\text{CrCl}_2(ox)_2]^{3-}\) - Exhibits cis- trans isomerism and cis isomer is optically active
B \([\text{PtCl}_2(\text{NH}_3)_2]\) - Exhibits both cis- trans and optical isomerism
C \([\text{Cr(C}_2\text{O}_4)_3]^{3-}\) - Exhibits cis- trans isomerism but is optically inactive
D \([\text{Fe(CN)}_4(\text{NH}_3)_2]^-\) - Exhibits cis- trans isomerism and both exhibit optical isomerism

Verified Solution

Answer & Solution

Correct Answer

(A) \([\text{CrCl}_2(ox)_2]^{3-}\) - Exhibits cis- trans isomerism and cis isomer is optically active

Step-by-step Solution

Detailed explanation

\([\text{CrCl}_2(ox)_2]^{3-}\) is an octahedral complex of the type \([M(AA)_2a_2]\). It exhibits geometrical isomerism, existing as cis and trans isomers. The trans isomer has a plane of symmetry and is optically inactive. The cis isomer lacks any plane or center of symmetry…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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