Which of the following is not an example of p | vedclass

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(D) Organometallic compounds are classified based on the nature of the metal-carbon bond.$\pi-$bonded organometallic complexes involve ligands like al

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Tetraethyl lead

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(D) Organometallic compounds are classified based on the nature of the metal-carbon bond.$\pi-$bonded organometallic complexes involve ligands like alkenes,alkynes,or arenes that donate $\pi-$electron density to the metal center.$1$. Ferrocene $[Fe(\eta^5-C_5H_5)_2]$ is a sandwich complex with $\pi-$bonding.$2$. Dibenzene chromium $[Cr(\eta^6-C_6H_6)_2]$ is a sandwich complex with $\pi-$bonding.$3$. Zeise's salt $[K[PtCl_3(\eta^2-C_2H_4)]]$ contains an ethylene ligand bonded via $\pi-$electrons.$4$. Tetraethyl lead $[Pb(C_2H_5)_4]$ contains $Pb-C$ $\sigma-$bonds only,where the ethyl group is bonded to the metal through a single carbon atom. Therefore,it is a $\sigma-$bonded organometallic compound.

Which of the following is not an example of $\pi-$bonded organometallic complex?

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