Question

Iupac name of [Cr(CN)2(Ch3Nh2)(NO2)2]Cl​

Answer 1

This one is a coordination compound [the compounds in which the ligand(ion or molecule) is bonded to a metal by coordinate bond]. So, in this case CN acts as a Ligand. Therefore, cynanido is used. The name of the complex will be - tetraamminodicyanidocobalt(III) chloride

Answer 2

The IUPAC name of $[Cr(CN)_2(CH_3NH_2)_2(NO_2)_2]Cl_3$ is dicyanidodi-(methylammine) dinitro chromium (III) chloride.

Explanation :

Rules for naming of the coordination compounds :

The ligand is named first.

The charge of metal indicated with the Roman numerals and enclosed in the parenthesis after metal name.

The ligands are named in alphabetical order before the metal ion.

Ligands that include a numerical prefix in the name use the prefixes bis for 2, tris for 3, or tetrakis for 4 to indicate their number.

In the given coordination compound, Cr is the chromium metal, $CN$ , $CH_3NH_2$ and $NO_2$ are ligands named as cyanido, methylamine and nitro.

x+2(-1)+1(0)+2(0)=+1

x=+3

IUPAC name of $[Cr(CN)_2(CH_3NH_2)(NO_2)_2]Cl_3$ is dicyanidodi-(methylammine) dinitro chromium (III) chloride.

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