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Which of the following organometallic compound is σ and π bonded?

1. Fe(η5–C5H5)2
2. Fe(CH3)3
3. K[PtCl3(η2–C2H4)]
4. [Co(CO)3NH3]2+

Correct answer: K[PtCl3(η2–C2H4)]

Solution

K[PtCl3(η2–C2H4)] contains ethylene (C2H4) as a ligand, which forms both σ and π bonds with the metal center. The π bond arises from the interaction of the metal d-orbitals with the π-electrons of ethylene.

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