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If the bond length of CO bond in carbon ...

If the bond length of CO bond in carbon monoxide is `1.128 Å`, then what is the value of CO bond length in `Fe (CO)_(5)` ?

A

`1.15Ã…`

B

`1.128Ã…`

C

`1.72Ã…`

D

`1.118Ã…`

Text Solution

Verified by Experts

The correct Answer is:
A
The metal -carbon bond in carbonyls possisses 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 `overset(**)pi` 2py orbital of carbon (`pi`M`rarr` C bond ) . The total bonding is thus M = C = O. Thus bond order of C-O bond is raduced from triple bond to double bond . As a rasult , C-O bond length of `1.128Ã…` in CO increases to about `1.15 Ã…` in many carbonyls.
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