Question

According to IUPAC nomenclature, sodium nitroprusside is named is :

• A. sodium pentacyanonitrosylferrate(III)
• B. sodium nitroferricyanide
• C. sodium nitroferrocyanide
• D. sodium pentacyanonitrosylferrate(II)

Answer 1

The correct option is D sodium pentacyanonitrosylferrate(II)

The formula of sodium nitroprusside is $N{a}_2\left[Fe\right(CN{)}_{5}NO]$.
The name of sodium cation is written first, the names of ligands are written in alphabetical order. hence ''cyano'' will be written prior to "nitrosyl''. The name of iron metal is written as ferrate.
Oxidation state of Fe be "x"
$x+5\times (-1)+1\times (+1)=-2$
$x=+2$
Therefore, name of the complex is sodium pentacyanonitrosylferrate(II).
The roman numeral (II) indicates oxidation state.