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Among the following, which is not the π-bonded organometallic compound?

1. (CH3)4Sn
2. K[PtCl3(η2–C2H4)]
3. Fe(η5–C5H5)2
4. Cr(η6–C6H6)2

Correct answer: (CH3)4Sn

Solution

The compound (CH3)4Sn does not involve π-bonding as it contains only σ-bonds between tin and methyl groups, unlike the other options which involve π-bonded ligands like ethylene, cyclopentadienyl, or benzene.

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