AIIMS 2004 Chemistry Stability of Complexes Assertion Reason Question
Assertion : The [Ni(en)₃]Cl₂ (en = ethylene diamine) has lower stability than [Ni(NH₃)₆]Cl₂.
Reason : In [Ni(en)₃]Cl₂, the geometry of Ni is trigonal bipyramidal.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Correct Answer
Detailed Explanation
[Ni(en)2]Cl2 is a chelating compound and chelated complexes are more stable than similar complexes with unidentate ligands as dissociation of the complex involves breaking of two bonds rather than one. In [Ni(en)2]Cl2, Ni with d8 configuration shows octahedral geometry. Six electrons will occupy the t2g orbitals and two electrons will occupy the eg orbitals.
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