1.

If the length of CO bond in carbon monoxide is 1.28 Å, then what is the value of CO bond length in Fe(CO)_(5) ?

Answer»

`1.15 Å`
`1.128 Å`
`1.72 Å`
`1.118 Å`

Solution :The metal-carbon bond in carbonyls possesses both `sigma` and `pi` character-weak `sigma` bond being formed by donation of ELECTRON pair from carbon to metal `(M larr C -= O)` and a STRONGER `pi`-bond being formed by back donation of electrons from FILLED `d_(xy)` orbital of metal into empty antibonding `pi_(2p_(y))^(*)` orbital of carbon `(pi M rarr C " bond")`. The total bonding is thus M = C = O. Thus, bond order of C-O bond is reduced from triple bond to double bond. As a result, C-O bond LENGTH of `1.128Å` in CO increases to about `1.15Å` in many carbonyls.


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