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NEET 2011
Exam
NEET
Year
2011
Subject
Chemistry
Chapter
Coordination Compounds

NEET 2011 · Chemistry · Coordination Compounds

Which of the following carbonyls will have the strongest C-O bond?

Which of the following carbonyls will have the strongest C−O\mathrm{C}-\mathrm{O} bond?

Options

  1. AMn⁡(CO)6+\operatorname{Mn}(\mathrm{CO})_6^{+}
  2. BCr(CO)6\mathrm{Cr}(\mathrm{CO})_6
  3. CV(CO)6−\mathrm{V}(\mathrm{CO})_6^{-}
  4. DFe(CO)5\mathrm{Fe}(\mathrm{CO})_5

Correct answer

A. Mn⁡(CO)6+\operatorname{Mn}(\mathrm{CO})_6^{+}

Step-by-step solution

As positive charge on the central metal atom increases, the less readily the metal can donate electron density into the anti bonding π\pi-orbitals of CO ligand to weaken the C−O\mathrm{C}-\mathrm{O} bond. Hence, the C−O\mathrm{C}-\mathrm{O} bond would be strongest in Mn(CO)6+\mathrm{Mn}(\mathrm{CO})_6^{+}.
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