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NEET2016ChemistryCoordination CompoundsActual

Which of the following has the longest C − O bond length? (Free C − O bond length in CO is 1 . 128   A o ).

Options

  1. AN i C O 4
  2. BCo CO 4 −
  3. CF e C O 4 2 -
  4. DMn CO 6 +

Correct answer

C. F e C O 4 2 -

Step-by-step solution

Metal carbon bond in metal carbonyls possess both σ and π character. M − C π bond is formed by donation of a pair of electrons from filled orbital of metal into vacant antibonding π orbital of CO . CO bond length increases if M has more tendency to donate lone pair. Tendency to donate lone pair is Fe 2 − > Co − > Ni > Mn +

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