A) \[{{d}^{1}}\] to \[{{d}^{3}}\] complexes
B) \[{{d}^{4}}\] to \[{{d}^{7}}\]complexes
C) \[{{d}^{7}}\]to \[{{d}^{9}}\] complexes
D) \[{{d}^{1}},\,{{d}^{2}}\]and \[{{d}^{8}}\] complexes
Correct Answer: B
Solution :
For \[{{d}^{1}},\,{{d}^{2}},\,{{d}^{3}},\,{{d}^{8}},\,{{d}^{9}}\] and \[{{d}^{10}}\] ions, the arrangement of electrons into \[{{t}_{2g}}\]and \[{{e}_{g}}\], sets is same for both strong and weak field ligands. But for \[{{d}^{4}},{{d}^{5}},{{d}^{6}}\] and \[{{d}^{7}}\], there is a difference in the arrangement of electrons into \[{{t}_{2g}}\] and \[{{t}_{g}}\] sets for strong and weak field ligands. A weak field ligand will have greater number of unpaired electrons.Iron | Weak field \[(\Delta <P)\] | Strong field \[(\Delta >P)\] | ||
\[{{t}_{2g}}\] | \[{{e}_{g}}\] | \[{{t}_{2g}}\] | \[{{e}_{g}}\] | |
\[{{d}^{4}}\] | ||||
\[{{d}^{5}}\] | ||||
\[{{d}^{6}}\] | ||||
\[{{d}^{7}}\] |
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