A) \[{{V}^{2+}}>C{{r}^{2+}}>R{{u}^{3+}}>F{{e}^{2+}}\]
B) \[{{V}^{2+}}>R{{u}^{3+}}>C{{r}^{2+}}>F{{e}^{2+}}\]
C) \[C{{r}^{2+}}>{{V}^{2+}}>R{{u}^{3+}}>F{{e}^{2+}}\]
D) \[C{{r}^{2+}}>R{{u}^{3+}}>F{{e}^{2+}}>{{V}^{2+}}\]
Correct Answer: A
Solution :
According to question all the complexes are low spin.| Complex | Configuration | No. of unpaired electrons |
| \[{{[V{{(CN)}_{6}}]}^{4-}}\] | \[t_{2g}^{3}e_{g}^{0}\] | \[3\] |
| \[{{[Cr{{(N{{H}_{3}})}_{6}}]}^{2+}}\] | \[t{{_{2g}^{{}}}^{4}}e_{g}^{0}\] | \[2\] |
| \[{{[Ru{{(N{{H}_{3}})}_{6}}]}^{3+}}\] | \[t{{_{2g}^{{}}}^{5}}e_{g}^{0}\] | \[1\] |
| \[{{[Fe{{(CN)}_{6}}]}^{4-}}\] | \[t{{_{2g}^{{}}}^{6}}e_{g}^{0}\] | \[0\] |
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