Which of the following has longest $C - O$ bond length? (Free $C - O$ bond length in $CO$ is $1.128 Å$ )

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

$[Co {(CO)}_{4}]^{⊝}$

${[Fe (CO)_{4}]}^{2 -}$

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

answer is C.

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Detailed Solution

${[Fe (CO)_{4}]}^{2 -}$ Since metal atom is carrying maximum $- ve$ charge therefore it would show maximum synergic bonding as a result $C - O$ bond length would be maximum.

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