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

Correct `(A)` Since 'en' is strong ligand than `NH_(3)` therefore `[Ni(en)_(3)]CI_(2)` is more stable than `[Ni(NH_(3))_(6)]CI_(2)` Correct `(R )` Since 'en' is bidendate ligand therefore `CN` of `Ni^(2+)` is `3 xx 2 =6`
Hnence hydisation and geometry of `Ni^(2+)` is `d^(2)sp^(3)` and octahedral .