Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The metal carbon bond in metal carbonyls possesses both $\sigma$ and $\pi$ character. Reason (R): The ligand to metal bond is a $\pi$ bond and metal to ligand bond is a $\sigma$ bond. In the light of the above statements, choose the most appropriate answer from the options given below:

• A

  Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B

  Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• Correct answer
  C

  (A) is correct but $(\mathrm{R})$ is not correct.
• D

  (A) is not correct but (R) is correct.

Solution

In case of metal carbonyls, the bonding has both \(\sigma\) and \(\pi\) nature, where ligand to metal bond is ' \(\sigma\) ' (coordinate) bond and metal to ligand bond is ' \(\pi\) ' (synergic) bond.

Hence, the correct answer is option: 'C'.