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NEET 2016
Exam
NEET
Year
2016
Subject
Chemistry
Chapter
Coordination Compounds

NEET 2016 · Chemistry · Coordination Compounds

Which of the following has the longest C - O bond length? (Free C -...

Which of the following has the longest C−OC - O bond length? (Free C−OC - O bond length in COCO is 1.128Ao1 . 128\overset{o}{A}).

Options

  1. ANi{\left(CO\right)}_{4}
  2. B[ Co (CO)4]−{\left[\text{ Co }{\left(CO\right)}_{4}\right]}^{-}
  3. C[Fe(CO)4]2−{\left[Fe{\left(CO\right)}_{4}\right]}^{2 -}
  4. D[ Mn (CO)6]+{\left[\text{ Mn }{\left(CO\right)}_{6}\right]}^{+}

Correct answer

C. [Fe(CO)4]2−{\left[Fe{\left(CO\right)}_{4}\right]}^{2 -}

Step-by-step solution

Metal carbon bond in metal carbonyls possess both σ\sigma and π\pi character. M−Cπ\text{M} - \text{C}\pi bond is formed by donation of a pair of electrons from filled orbital of metal into vacant antibonding π\pi orbital of CO\text{CO} . CO\text{CO} bond length increases if M has more tendency to donate lone pair.

Tendency to donate lone pair is Fe2−>Co−>Ni>Mn+{Fe}^{2 -} > {Co}^{−} > Ni > {Mn}^{+}
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