• # question_answer Which of the following has longest C-O bond length? (Free C-O bond length in Co is$1.128\overset{\text{o}}{\mathop{\text{A}}}\,$). Note:- Since metal atom is carrying maximum -ve charge therefore it would show maximum synergic bonding as sa resultant C-O bond length would be maximum. A)  $Ni{{(CO)}_{4}}$                          B)  ${{[Co{{(CO)}_{4}}]}^{\text{O}-}}$C)  ${{[Fe{{(CO)}_{4}}]}^{2-}}$                     D)   ${{[Mn{{(CO)}_{6}}]}^{+}}$

Solution :

${{[Fe{{(CO)}_{4}}]}^{2-}}$

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