51 The bond length of CO bond in carbon monoxide is 1.128 . The CO bond in Fe(CO) is (1) 1.158 (2) 1.128 (3) 3.28 (4) 1.118

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Solution

The explanation for the correct option:
Option(1) 1.158
In the molecule $F e {(C O)}_{5}$ there exists a synergic bond between Fe and CO.
A synergic bond can be defined as the movement of electrons from ligands to metal. it is also known as backbonding.
The filled molecular orbital of Fe donates the electron pairs to the antibonding molecular orbitals of carbon monoxide CO.
Due to this synergic bond formation between Fe and CO, the bond order of CO decreases.
As bond order decreases the Bond length increases.
Hence, Option(1) 1.158 is the only option having greater bond length than 1.128

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