(D) The Assertion is incorrect because $[Ni(en)_3]Cl_2$ is more stable than $[Ni(NH_3)_6]Cl_2$ due to the chelate effect.Ethylenediamine $(en)$ is a b

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If both the Assertion and Reason are incorrect.

(D) The Assertion is incorrect because $[Ni(en)_3]Cl_2$ is more stable than $[Ni(NH_3)_6]Cl_2$ due to the chelate effect.Ethylenediamine $(en)$ is a bidentate ligand,which forms stable five-membered chelate rings with the $Ni^{2+}$ ion,whereas $NH_3$ is a monodentate ligand.The Reason is also incorrect because the geometry of $Ni$ in $[Ni(en)_3]Cl_2$ is octahedral,not trigonal bipyramidal.

Class 12 Chemistry Coordination Compounds Complexes and complex stability

Medium

Assertion : The $[Ni(en)_3]Cl_2$ ($en =$ ethylenediamine) has lower stability than $[Ni(NH_3)_6]Cl_2$.
Reason : In $[Ni(en)_3]Cl_2$,the geometry of $Ni$ is trigonal bipyramidal.

AIIMS 2004 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.