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NEET CHEMISTRYMedium

Select the correct option based on the statements below: Assertion (A): The metal-carbon bond in metal carbonyls possesses both σ\sigma and π\pi character. Reason (R): The ligand to metal bond is a π\pi bond and metal to ligand bond is a σ\sigma bond.

A

Both (A) and (R) are True and (R) is the correct explanation of (A).

B

Both (A) and (R) are True but (R) is not the correct explanation of (A).

C

(A) is True but (R) is False.

D

(A) is False but (R) is True.

Step-by-Step Solution

Assertion (A) is true because the metal-carbon bond in metal carbonyls possesses both σ\sigma and π\pi character. Reason (R) is false because the ligand to metal bond is a σ\sigma bond (formed by the donation of a lone pair of electrons on the carbonyl carbon into a vacant orbital of the metal) and the metal to ligand bond is a π\pi bond (formed by the donation of a pair of electrons from a filled dd orbital of the metal into the vacant antibonding π∗\pi^* orbital of carbon monoxide).

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