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)   \[{{[Mn{{(CO)}_{6}}]}^{+}}\]