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The pair of ions which do not have same number of unpaired electrons is

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Mn²⁺ and Fe³⁺

Ti²⁺ and Ni²⁺

Cu²⁺ and Ti³⁺

Fe²⁺ and Ni²⁺

answer is D.

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Detailed Solution

Let, n= number of unpaired electrons
Mn²⁺ : [Ar]4s⁰3d⁵ (n=5) & Fe³⁺ : [Ar]4s⁰3d⁵ (n=5)

Ti²⁺ : [Ar]4s⁰3d² (n=2) & Ni²⁺ : [Ar]4s⁰3d⁸ (n=2)

Cu²⁺ : [Ar]4s⁰3d⁹ (n=1) and Ti³⁺ : [Ar]4s⁰3d¹(n=1)

Fe²⁺ : [Ar]4s⁰3d⁶ (n=4) and Ni²⁺: [Ar]4s⁰3d⁸ (n=2)

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