Q60 / 180 · AIIMS 2007 · Chemistry

Assertion : \(\mathrm{C}-\mathrm{O}\) bond in metal carbonyl is long. Reason : There is delocalisation of electrons from filled \(d\) orbitals into the empty orbitals on the \(\mathrm{CO}\) ligands.

  • Correct answer
    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

Solution

\(\mathrm{C}-\mathrm{O}\) bond in metal carbonyl is long as ligated \(\mathrm{CO}\) has lower bond order. The lower B.O. is due to the transfer of metal \(d \pi\) electrons into the \(\pi^*\) orbitals of ligated \(\mathrm{CO}\).

Hence, the correct answer is option: 'A'.

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