MEDIUMMCQ SINGLENEET ChemistryInorganic ChemistryCoordination compoundsPrevious Year Questions

Which of the following has longest C-O bond length? (Free C-O bond length is CO is 1.128Å.) (NEET 2016)

A.Ni(CO)4

B.[Co(CO)4]+

C.[Fe(CO)4]✓ Correct

D.[Mn(CO)6]

Explanation

The higher the oxidation state of the central metal atom, the shorter will be the bond length of C−O bond as the bond will be strong. In [Ni(CO)4] ⇒ the Oxidation state of Ni = 0 In [CO(CO)4]+ ⇒ the Oxidation state of Co = +1 In [Fe(CO)4]2– ⇒ the Oxidation state of Fe = −2 In [Mn(CO)6]+ ⇒ the Oxidation state of Mn = +1 Therefore, [Fe(CO)4]2– molecule has lowest oxidation state of central metal atom. Therefore, it has the longest C−O bond length.

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