The question has two statements. Statement I and statement II.
Statement I: The metal-carbon bond in metal carbonyls possess $“ σ ”$ character only.
Statement II: In metal carbonyls, the M – C $σ$ bond is formed by the donation of a pair of electrons from a filled d orbital of metal into the vacant antibonding $π *$ orbital of carbon monoxide.
In light of the given statements, choose the most appropriate answer from the options given below.

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Both statement I and statement II are correct.

Statement I is incorrect but statement II is correct.

Statement I is correct but statement II is incorrect.

Both statement I and statement II are incorrect.

answer is B.

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Detailed Solution

In metal carbonyls, the metal-carbon bond possess both $σ - π$ character. The M - C σ bond is formed by the donation of lone pair of electrons on the carbonyl carbon into a vacant orbital of the metal. The M-C $π$ bond is formed by the donation of a pair of electrons from a filled d orbital of metal into the vacant antibonding $π *$ orbital of carbon monoxide.

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