Which of the following statements about $F e (C O)_{5}$ is correct?

It is paramagnetic and high spin complex

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It is diamagnetic and high spin complex

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It is diamagnetic and low spin complex

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It is paramagnetic and low spin complex

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Solution

The correct option is D It is diamagnetic and low spin complex

$F e (C O)_{5}$
$_{26} F e ⟶ 3 d^{6} 4 s^{2}$
(Refer to Image 1)
$F e (C O)_{5} ⟶$ (Refer to Image 2)
$C O$ being strong field ligand causes pairing thereby making it diamagnetic. Hence, is a low spin complex.
$∴$ Answer is option C.

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