NEET-XII-Chemistry
exam-1 year:2016
- #74Which of the following has longest C-O bond
length? (Free C-O bond length in Co is 1.128Å).
(1) ``Ni(CO)_4``
(2) ``[Co(CO)_4]^\circleddash ``
(3) ``[Fe(CO)_4]^{2-}``
(4) ``[Mn(CO)_6]^+``digAnsr: 3Ans : (3)
Sol. [Fe(CO)4]2-
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.