Question

The correct name for the complex ion $\left[CoCl\right(ONO\left)\right(en{)}_2{]}^{+}$ is:

• A. Chlorobis(ethylenediamine)nitrito-O-cobaltate(III) ion
• B. Chlorodiethyldiaminenitrito-O-cabalt(III) ion
• C. Chloronitrito-O-diethyldiamine cobaltate(III) ion
• D. Chlorobis(ethylenediamine)nitrito-O-cobalt(III) ion

Answer 1

The correct option is D Chlorobis(ethylenediamine)nitrito-O-cobalt(III) ion

In this complex the ligands involved are chloro, nitrito and ethylenediamine. While naming the complex we will write them in alphabetical order and since two ethylenediamine ligands are present so we will use bis(ethylenediamine). Again it is a positive ion so we will not use cobaltate here. So the correct name of for the given complex ion is chlorobis(ethylenediamine)nitrito-O-cobalt(III) ion.