Order of CFSE across a set of cobalt complexes

1. A.
   A $<$ B $<$ C $<$ D
2. B.
   B $<$ A $<$ C $<$ D
3. C.
   B $<$ C $<$ D $<$ A
4. D.
   C $<$ D $<$ B $<$ A

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1. A.
   $\left\lbrack Co\left( {NH}_{3} \right)_{4} \right\rbrack^{2 +} < \left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{2 +} < \left\lbrack Co(en)_{3} \right\rbrack^{3 +} < \left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{3 +}$
2. B.
   $\left\lbrack Co\left( {NH}_{3} \right)_{4} \right\rbrack^{2 +} < \left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{2 +} < \left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{3 +} < \left\lbrack Co(en)_{3} \right\rbrack^{3 +}$
3. C.
   $\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{2 +} < \left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{3 +} < \left\lbrack Co\left( {NH}_{3} \right)_{4} \right\rbrack^{2 +} < \left\lbrack Co(en)_{3} \right\rbrack^{3 +}$
4. D.
   $\left\lbrack Co(en)_{3} \right\rbrack^{3 +} < \left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{3 +} < \left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{2 +} < \left\lbrack Co\left( {NH}_{3} \right)_{4} \right\rbrack^{2 +}$

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1. A.
   Both Statement-I and Statement-II are true.
2. B.
   Both Statement-I and Statement-II are false.
3. C.
   Statement-I is true but Statement-II is false.
4. D.
   Statement-I is false, but Statement-II is true.

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