Practicing Success

Target Exam

CUET

Subject

Chemistry

Chapter

Inorganic: Coordination Compounds

Question:

Coordination compounds are formulated and named according to the IUPAC system.

Few rules for naming coordination compounds are:

(I) In ionic complex, the cation is named first and then the anion.

(II) In the coordination entity, the ligands are named first and then the central metal ion.

(III) When more than one type of ligands are present, they are named in alphabetical order of preference with any consideration of charge.

As per IUPAC nomenclature, what is the name of the complex [Co(H2O)4(NH3)2]Cl3 ?
 

Options:

tetraaquadiamminecobalt(II) chloride

tetraaquadiamminecobalt(III) chloride

diamminetetraaquacobalt(II) chloride

diamminetetraaquacobalt(III) chloride

Correct Answer:

diamminetetraaquacobalt(III) chloride

Explanation:

The name of the complex [Co(H2O)4(NH3)2]Clis diamminetetraaquacobalt(III) chloride.

[Co(H2O)4(NH3)2]Cl→ [Co(H2O)4(NH3)2]3+ + 3Cl- 

[Co(H2O)4(NH3)2]3+ 

x + 4(0) + 2 (0) = 3

x = 3