First slide

IUPAC Nomenclature

Question

The IUPAC name of $[Co {({NH}_{3})}_{5} ({CO}_{3})] Cl$ is

Moderate

A

Penta ammine carbonyl cobalt (III) chloride
B

Penta amino chloro cobalt (III) carbonate
C

Penta ammine carbonato cobalt (III) chloride
D

Penta amino carbonato chloro cobaltate (III)

Solution

$Ligands are {NH}_{3} . . ammine {CO}_{3}^{- 2} . . carbonate Counter ion is chloride ({Cl}^{-})$
Total negative charge = -3
$∴$ oxidation state of cobalt is “+3”
while naming a complex, ligands are named first in alphabetical order followed by central metal with its oxidation state as roman number in parenthesis. IUPAC name of the complex is Penta ammine carbonato cobalt (III) chloride.

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