The correct statement(s) regarding the binary | vedclass

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(C) $1$. The total number of valence shell electrons at the metal centre in $Fe(CO)_5$ $(8 + 5 	imes 2 = 18)$ and $Ni(CO)_4$ $(10 + 4 	imes 2 = 18)$

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$B, C$

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(C) $1$. The total number of valence shell electrons at the metal centre in $Fe(CO)_5$ $(8 + 5 	imes 2 = 18)$ and $Ni(CO)_4$ $(10 + 4 	imes 2 = 18)$ is $18$,not $16$. Thus,statement $A$ is incorrect.$2$. Metal carbonyls are predominantly low spin complexes because $CO$ is a strong field ligand. Thus,statement $B$ is correct.$3$. The metal-carbon bond strengthens as the oxidation state of the metal decreases because a lower oxidation state increases the electron density on the metal,which enhances back-bonding to the $CO$ ligand. Thus,statement $C$ is correct.$4$. The $C-O$ bond weakens when the oxidation state of the metal is lowered (due to increased back-bonding),not when it is increased. Thus,statement $D$ is incorrect.

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