Chemistry - Coordination Chemistry Question with Solution | TestHub

The correct IUPAC name for the complex $[Pt(N{H}_3{)}_3(ONO)]N{O}_3$ is Triamminenitrito-O-platinum(II) nitrate.

Here is the breakdown of the name:

Ligands: There are three ammine ($N{H}_3$) groups and one nitrito group bonded through Oxygen ($-ONO$), hence Triamminenitrito-O.

Central Metal: The metal is platinum, and its oxidation state is +II (calculated as $x+3(0)+(-1)=+1\Rightarrow x=+2$).

Counter Ion: The anion outside the coordination sphere is nitrate ($N{O}_3^{-}$).

Final Name: Combining these alphabetically (ammine before nitrito) gives Triamminenitrito-O-platinum(II) nitrate (Option C).