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Question

Incorrect option about the complex [Fe(CO)5] is:
  1. Its effective atomic number is 36
  2. It has a square pyramidal structure
  3. It has an hybridization of dsp3
  4. It has a larger CO bond length than the normal CO bond length


Solution

The correct option is B It has a square pyramidal structure
In Fe(CO)5, Fe is neutral having 26 electrons and total of 10 electrons are donated by 5 CO ligands. So EAN = 36.

It has a trigonal bipyramidal geometry.

CO is a very strong field ligand which promotes the pairing of electrons in Fe. Hence an inner-orbital complex is formed with dsp3 hybridization.

Due to the formation of synergic bond, CO bond length increases than the normal CO bond length.

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