Which of the following is a low spin complex?

Options

A. (a) `Fe(CN)_6^(3-)`
B. (b) `Co(NO_2)_6^(3-)`
C. (c) `Mn(CN)_6^(3-)`
D. (d) All

Answer

D

Explanation

`Fe(26)`
`CN^(-)` is strong ligand, it pairs with the electron and forms low spin complex
`Co(27)`
`NO_2^(-)` is able to cause the pairing of electrons so low spin complex will form.
`Mn(25)`
`CN^(-)`, strong ligand, causes the pairing of electron