The bond length in CO is $1.128 Å$ . What will be the bond length of CO in $Fe {(CO)}_{5}$ ?

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$1.72 Å$

$1.118 Å$

$\begin{aligned} 1.158 Å \end{aligned}$

$1.128 Å$

answer is A.

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Detailed Solution

There is a synergistic link between Fe and CO in the compound $Fe (CO)_{5}$ . The bond order of CO decreases as a result of metal and CO forming synergistic bonds. Bond length grows as bond order gets smaller. Option $\begin{aligned} 1.158 Å \end{aligned}$ is the only one with a longer bond length than $1.128 Å$ in this case. As a result, choice A is the right response.
Hence correct option A

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