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5. Co-ordination chemistry — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
In $Fe(CO)_5,$ the $Fe - C$ bond possesses
  • A
    ionic character
  • B
    $\sigma -$character only
  • C
    $\pi -$character
  • ✓
    both $\sigma$ and $\pi$ characters
✓

Answer

Correct option: D.
both $\sigma$ and $\pi$ characters
d
Due to some back-bonding by side-wise overlapping of between $d$ -orbitals of metal and $p$ -orbon, the $F e-C$ bond in $F e(C O)_{5}$ has both $\sigma$ and $\pi$ character.

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