Assertion The `[Ni(en)_(3)]CI_(2)` (en = ethylenediamine has lower stability than `[Ni(NH_(3))_(6)]CI_(2)`
Reason `In [Ni(en)_(3)]CI_(2)` the geometry of Ni is trigonal bipyramidal .

Options

A. If both `(A)` and ` (R )` are correct and `(R )` is the correct explanation of `(A ) ` .
B. If both `(A)` and ` (R )` are correct and `(R )` is the correct explanation of `(A ) ` .
C. If`(A)` is correct, but `( R )` is incorrect .
D. Both `(A)` and `(R ) ` are incorrect .

Explanation

To solve the question regarding the stability of the complexes \([Ni(en)_3]Cl_2\) and \([Ni(NH_3)_6]Cl_2\), we will analyze the assertion and reason provided step by step.

### Step 1: Analyze the Assertion
The assertion states that \([Ni(en)_3]Cl_2\) has lower stability than \([Ni(NH_3)_6]Cl_2\).

- **Stability of Complexes**: The stability of coordination complexes is influenced by the nature of the ligands. Ethylenediamine (en) is a bidentate ligand, while ammonia (NH₃) is a monodentate ligand. Bidentate ligands can form chelate rings, which generally increase the stability of the complex.

### Step 2: Compare the Ligands
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