The C-O bond length in carbon monoxide is 1.1 | vedclass

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(A) In metal carbonyls like $Fe(CO)_5$,there is a synergistic bonding effect. The metal atom donates electron density from its filled $d$-orbitals int

Vedclass · Accepted Answer

$1.16$

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(A) In metal carbonyls like $Fe(CO)_5$,there is a synergistic bonding effect. The metal atom donates electron density from its filled $d$-orbitals into the empty antibonding $\pi^*$ orbitals of the $CO$ ligand. This back-bonding increases the electron density in the antibonding orbital of $CO$,which decreases the $C-O$ bond order. As the bond order decreases,the $C-O$ bond length increases compared to free $CO$ $(1.128 \ \mathring{A})$. In $Fe(CO)_5$,the observed $C-O$ bond length is approximately $1.16 \ \mathring{A}$.

The $C-O$ bond length in carbon monoxide is $1.128 \ \mathring{A}$. The $C-O$ bond length in $Fe(CO)_5$ is equal to .......... $\mathring{A}$.

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