In $\mathrm{Fe}{\left(\mathrm{CO}\right)}_{5},$ the $\mathrm{Fe}-\mathrm{C}$ bond possesses

1. A

$\mathrm{\pi }-$character only

2. B

Both $\mathrm{\sigma }$ and $\mathrm{\pi }$ characters

3. C

Ionic character

4. D

$\mathrm{\sigma }-$ character only

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Solution:

There is $\mathrm{d\pi }-\mathrm{p\pi }$ metal to ligand back bonding in $\mathrm{Fe}-\mathrm{C}$ bond of the organometallic compound $\mathrm{Fe}{\left(\mathrm{CO}\right)}_{5}.$ So it possesses both $\mathrm{\sigma }$ and $\mathrm{\pi }$ characters.

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