Question

Identify the coordination isomer of [Fe(CO)4][Zn(CN)4].

(a) Tetracyanidozinc(II) tetracarbonylferrate(II)

(b) Tetracarbonylzinc(II) tetracyanidoferrate(II)

(c) Tetracyanidoiron(II) tetracarbonylzincate(II)

(d) Tetracarbonyliron(II) tetracyanidozincate(II)

The question was asked in an interview for job.

I want to ask this question from Isomerism in Coordination Compounds in section Coordination Compounds of Chemistry – Class 12

Answer 1

Correct option is (b) Tetracarbonylzinc(II) tetracyanidoferrate(II)

Explanation: The coordination isomer will be [Zn(CO)4][Fe(CN)4] by interchanging the central atoms between the two complexes with [Zn(CO)4]^2+ being the cationic complex and [Fe(CN)4]^2- being anionic. The naming will be tetracarbonylzinc(II) tetracyanidoferrate(II).