NEET UG CHEMISTRY MCQ: CO-ORDINATION COMPOUNDS

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Arrange the following cobalt complexes in the order of increasing crystal field stabilization energy (CFSE) value. Complexes

\mathop {{{\left[ {Co{F_6}} \right]}^{3 - }}}\limits_{(A)} ,\,\,\,\mathop {{{\left[ {Co{{\left( {{H_2}O} \right)}_6}} \right]}^{3 + }}}\limits_{(B)} ,\,\,\,\,\mathop {{{\left[ {Co{{\left( {N{H_3}} \right)}_6}} \right]}^{3 + }}}\limits_{\left( C \right)} \,\,\mathrm{and}\,\,\mathop {{{\left[ {Co{{\left( {en} \right)}_3}} \right]}^{3 + }}}\limits_{\left( D \right)}

Choose the correct option.

View answer and explanation

Correct option: A

A < B < C < D\,

Option A (

A < B < C < D\,

) is correct because the spectrochemical series dictates the ligand field strength order:

F^- < H_2O < NH_3 < en

, hence the increasing CFSE order is

A < B < C < D

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