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Choose the complex entity which follow(s) EAN rule:

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$Fe {(CO)}_{5}$

${[Mn (CO)_{5}]}^{-}$

$[Ni (CO)_{4}]$

All of these

answer is D.

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Detailed Solution

Complex carbonyls are then followed by Sid Wick's EAN rule, which states that compounds having an EAN of 36 will be significantly more stable than other metal carbonyls.
Iron pentacarbonyl's EAN number is 36.

$[N i (C O)_{4}] \Rightarrow E A N = 36; [F e (C O)_{5}] \Rightarrow E A N = 36$

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