Why is [Ni(en)_3]^ 2+ nearly 10^ 10 times more stable than [Ni(NH_3)_6]^ 2+

JEE Advanced Chemistry question

Why is nearly times more stable than

(A) evaporates easily and causes instability to complex
(B)Six ligands cause steric hindrance around the centre
(C)'en' is a chelating ligand and forms thermodynamically more stable complexesCorrect
(D) is the weakest ligand known

Answer: (C)

Solution

This dramatic stability enhancement is a textbook example of the chelate effect: replacing six separate monodentate ligands with three bidentate chelating en ligands greatly increases the favourable entropy change of complex formation

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Question ID VK-160123