Among the following which is not the $\pi$-bonded organometallic compound?

Among the following which is not the $\pi$-bonded organometallic compound?
  1. $\mathrm{K}\left[\mathrm{PtCl}_3\left(\eta^2-\mathrm{C}_2 \mathrm{H}_4\right)\right]$
  2. $\mathrm{Fe}\left(\eta^5-\mathrm{C}_2 \mathrm{H}_5\right)_2$
  3. $\mathrm{Cr}\left(\eta^6-\mathrm{C}_6 \mathrm{H}_6\right)_2$
  4. $\left(\mathrm{CH}_3\right)_4 \mathrm{Sn}$

Solution

$\left(\mathrm{CH}_3\right)_4 \mathrm{Sn} \text { is a sigma bonded }$

Related Theory
The bond between the metal atom and the carbon belonging to the organic compound is covalent in nature. When metals with relatively high electropositivity (such as sodium and lithium) form organo-metallic compounds, a carbanionic nature is exhibited by the carbon which is bound to the central metal atom.

Asked in: NEET 2003

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