In the cystal field of the complex `[Fe(Cl)(CN)_(4)(O_(2))]^(4-)` the electronic configuration of metalis found to be `t_(2g)^(6),e_(g)^(o)` then which of the following is/are true about this complex ion :

Options

A. It is a paramagnetic complex
B. O-O bond length will be more than found in `O_(2)` molecule
C. Its IUPAC name will be chloridotetacyanidosuperoxidoferrate (II) ion.
D. It will show geometrical as will as optical isomerism

Explanation

(A,B,C)
`CN^(-)` is strong field ligand so comples for pairing of electrons. So
`[Fe(Cl)(CN)_(4)(O_(2))]^(-4)`

(A) No unpaired electrons in `Fe^(2+)` but `O_(2)^(-)` has unpaired electron
(B) `(O_(2))is O_(2)^(-)` i.e. superoxide ion which has B.O (1.5) less than `O_(2)` molecule (2.0) and thus this statement is correct.
(C ) Total negative charge of negative ligands in coordination spher is -6 So oxidation state of Fe is (II) and thus its IUPAC name is correct.
(D) It has a plane of symmetry, thus not show optical isomeris.