Consider the following statements about the applications of coordination compounds.
(A) The colour reactions given by metal ions with chelating ligands such as DMG (dimethylglyoxime) and α-nitroso-β-naphthol form the basis for their detection and estimation.
(B) The rhodium complex [(Ph3P)3RhCl], a Wilkinson catalyst, is used for the oxidation of alkenes.
(C) Articles can be electroplated with silver more smoothly and evenly from a solution of simple silver ions than from a solution of the complex [Ag(CN)2]−.
(D) Some coordination compounds of platinum, such as cis-platin, effectively inhibit the growth of tumours.
Which of the statements given above are incorrect? Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (B) and (C) only
Coordination compounds are used in analysis, industry and medicine; in each use, the formation of a complex is what does the job.
(A) The colour reactions given by metal ions with chelating ligands such as DMG (dimethylglyoxime) and α-nitroso-β-naphthol form the basis for their detection and estimation. — Correct statement. The coloured coordination entities formed with these reagents are used in classical and instrumental analysis.
(B) The rhodium complex [(Ph3P)3RhCl], a Wilkinson catalyst, is used for the oxidation of alkenes. — Incorrect statement. Wilkinson catalyst is used for the hydrogenation of alkenes, that is, adding hydrogen to the C=C bond, not for oxidation.
(C) Articles can be electroplated with silver more smoothly and evenly from a solution of simple silver ions than from a solution of the complex [Ag(CN)2]−. — Incorrect statement. It is the other way round: the deposit is smoother and more even from the complex [Ag(CN)2]− than from simple Ag+ ions.
(D) Some coordination compounds of platinum, such as cis-platin, effectively inhibit the growth of tumours. — Correct statement. Cis-platin and related platinum compounds are used against tumours.
NCERT (2026-27 edition):
5.7 Importance and Applications of Coordination Compounds – “The familiar colour reactions given by metal ions with a number of ligands (especially chelating ligands), as a result of formation of coordination entities, form the basis for their detection and estimation by classical and instrumental methods of analysis. Examples of such reagents include EDTA, DMG (dimethylglyoxime), α–nitroso–β–naphthol, cupron, etc.”
“Examples include rhodium complex, [(Ph3P)3RhCl], a Wilkinson catalyst, is used for the hydrogenation of alkenes.”
“Articles can be electroplated with silver and gold much more smoothly and evenly from solutions of the complexes, [Ag(CN)2]– and [Au(CN)2]– than from a solution of simple metal ions.”
“Some coordination compounds of platinum effectively inhibit the growth of tumours. Examples are: cis–platin and related compounds.”