EAN of metal in any monometallic carbonyl complex remains same when:-

Three carbonyls

(C O)

ligands are replaced by two nitrosyl

(N O)

ligands

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Two carbonyls ligands are replaced by three nitrosyl ligands

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All the carbonyls ligands are replaced by all nitrosyl ligands

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One carbonyls ligands is replaced by three nitrosyl ditrosy ligands

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Solution

The correct option is C All the carbonyls ligands are replaced by all nitrosyl ligands
Because $C O$ and $N O$ , both of them forms $1$ coordinate bond at a time and both are neutral ligands. Hence $E A N$ will remain same when all the carbonyl ligands are replaced by all nitrosyl ligands.
$∴$ Answer is option C.

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