The correct order of M–C π bond and strength in given metal…

Chemistry D and F - Block Elements General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

The correct order of M–C π bond and strength in given metal carbonyls is -

[Fe(CO) 4 ] 2– > [Co(CO) 4 ] – > [Ni(CO) 4 ]

[Ni(CO) 4 ] > [Co(CO) 4 ] – > [Fe(CO) 4 ] 2–

[Fe(CO) 4 ] 2– > [Ni(CO 4 )] > [Co(CO) 4 ] –

[Ni(CO) 4 ] > [Co(CO) 4 ] – = [Fe(CO) 4 ] 2–

Text Solution

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The correct answer is:

The greater the positive charge on the central metal atom, less readily the metal can donate electron density into the π order of the carbon dioxide ligands to weaken the C–O bonds. Hence more the –ve charge density on metal more the strength of M–C π bond.

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