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The number of carbon atoms found in π-bonded organometallic compounds is indicated by the Greek letter 'η' with a number. The prefixes η2, η5, and η6 indicate that 2, 5, and 6 carbon atoms are bound to the metal in the compound. Which of the following statements is correct?

1. (CH3)4Sn does not involve any π(η) bond formation.
2. (CH3)4Sn is a σ-bonded organometallic compound.
3. In metal carbonyl complexes, σ and π bonds are present because of synergic bonding.
4. Thus, [Co(CO)3(NH3)]2+ has σ and π bonding.

Correct answer: In metal carbonyl complexes, σ and π bonds are present because of synergic bonding.

Solution

Metal carbonyl complexes exhibit synergic bonding, where σ bonds form due to metal-to-ligand donation and π bonds form due to ligand-to-metal back-donation. This makes option C correct.

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