COMEDK · Chemistry · 24. Coordination Compounds

Which one of the following is an incorrect statement pertaining to the properties of Coordination compounds?

A Out of cis- \(\left[\mathrm{CrCl}_2(\mathrm{ox})_2\right]^{3-}\) and trans- \(\left[\mathrm{CrCl}_2(\mathrm{ox})_2\right]^{3-}\), the trans isomer is optically inactive.
B [\(\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{NO}_2\)] Cl₂ exists in 2 forms, the red form and the yellow form which are linkage isomers.
C \(\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}\) is called a Low spin complex.
D A square planar complex of the type Mabcd, where a, b, c and d are unidentate ligands, exhibits geometrical isomerism and exists in one cis-form and two trans-forms.

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Answer & Solution

Correct Answer

(D) A square planar complex of the type Mabcd, where a, b, c and d are unidentate ligands, exhibits geometrical isomerism and exists in one cis-form and two trans-forms.

Step-by-step Solution

Detailed explanation

(1) Correct: Trans-\([CrCl_2(ox)_2]^{3-}\) has a plane of symmetry \(\to\) optically inactive. (2) Correct: \([Co(NH_3)_5NO_2]Cl_2\) shows linkage isomerism as \(NO_2^-\) is an ambidentate ligand (coordinates through N or O). (3) Correct: \([Fe(CN)_6]^{3-}\) has \(Fe^{3+}\)…

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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