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Among the following metal carbonyls, the C – O bond order is lowest in

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$[Cr {(CO)}_{6}]$

${[V {(CO)}_{6}]}^{-}$

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

${[Mn {(CO)}_{6}]}^{+}$

answer is D.

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Detailed Solution

Carbon-oxygen bond order in ‘CO’ is three ;

In metal carbonyls C-O bond order will be between 2-3;

Due to back bonding M-C bond will have bond order of 1-2;

Back bonding is due to donation of electron pair from metal to carbon of ‘CO’ into its π* ABMO.

In option (4) the complex have negative charge, so backdonation by metal is high.

$∴$ M-C bond order increases.

Ultimately C-O bond order decreases.

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