NEET2026ChemistryChapterActual
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In metal carbonyls, the bond between the metal and the carbon monoxide ligand is strengthened by a synergic effect. Reason (R): The metal-carbon bond is formed by the donation of electrons from a filled d orbital of the metal into the vacant bonding orbital of carbon monoxide. In the light of the a
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
C. (A) is correct but (R) is not correct
Step-by-step solution
Assertion (A) is correct because the metal-carbon bond in metal carbonyls possesses both and character. The synergic effect, which involves both -donation from the ligand to the metal and -back donation from the metal to the ligand, strengthens the bond between the metal and carbon monoxide. Reason (R) is incorrect because the metal-carbon bond is formed by the donation of a pair of electrons from a filled d orbital of the metal into the vacant antibonding ^ * orbital of carbon monoxide, not the bonding orbital. Th