The IUPAC name of `[Co(NH_(3))_(5)(NCS)]CI_(2)` is

Options

A. pentaammi9ne (thiocyanato-S)cobalt (III) chloride
B. pentaammine (thiocyanato-N)cobalt (III) chloride
C. pentaammine (mercapto-N)cobalt (III) chloride
D. pentaammine (isothiocyanato-N)cobalt (III) chloride

Answer

B

Explanation

The cation is named first in both positively and nagatively charged coordination entities. The ligands are written as prefixes of the metal name. Neural ligands are given the same name as the parent molecule, whereas the names of negative lignds are given the ending ---O insted of ----e. Coordinated ammonia is commonly named ammine. For multipe ligands, the prefixes di-, tri-, tetra-, penta-, and hexa are used 2, 3, 4, 5 and 6, respectively. `SCN^(-)` ion is a chelating ligand, it can coordinate either through the sulphur (thiocyanato-S) or through nitrogen atom (thiocyanato--N).