Home Chemistry Co-ordinatios Compounds General The correct IUPAC name for the compound [Co(…
Chemistry Co-ordinatios Compounds General Single Correct MCQ
Published on: August 12, 2026

The correct IUPAC name for the compound [Co(NH3)4CI(ONO)]Cl is :

A
Tetraamminechloridonitrito–N–cobalt (III) chloride
B
Chloridonitrito–O–tetraamminecobalt (II) chloride
C
Dichloridonitrito–O–tetraamminecobalt (III)
D
Tetraamminechloridonitrito–O–cobalt (III) chloride

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Verified by Experts
The correct answer is:
D

Cation is named first followed by anion. In coordination sphere the ligands are named alphabetically followed by name of metal ion and then its oxidation state in Roman numeral. In [Co(NH3)4Cl(ONO)]+Cl–, cobalt is in +3 oxidation state and the complex is cationic. ONO ligand attach to metal ion through O atom ; so — O — is used while naming as nitrito before the name of metal ion. So IUPAC name given in option is correct.

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