1.

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

Answer»

If both assertion and reason are true and reason is the CORRECT explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reasonb is FALSE
If both assertion and reason are false.

Solution :C - O bond in METAL carbonyl is long as liganted 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 CO.


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