Coordination CompoundHard

Question

Which of the following statements is/are true for the complexes, [Fe(H2O)6]2+, [Fe(CN)6]4-, [Fe(C2O4)3]3- and [Fe(CO)5] ?

Options

A.Only [Fe(C2O4)3]3- show optical isomerism.
B.[Fe(C2O4)3]3- is less stable than [Fe(CN)6]2-
C.All complexes have same effective atomic number.
D.[Fe(CO)5] shows back bonding.

Solution


[Fe(H2O)6]2+ and [Fe(CN)6]4- do not show optical isomerism because of the presence of plane of symmetry as well as centre of symmetry.
(B) [Fe(C2O4)3]3 has three, five membered chelating rings and thus is more stable due to chelation.
(C) [Fe(H2O)6]2+ ; EAN = 26 - 2 + 12 = 36
[Fe(CN)6]4- ; EAN = 26 - 2 + 12 = 36
[Fe(C2O4)3]3- ; EAN = 26 - 3 + 12 = 35
(D) Fe CO

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