Among $\mathrm{Mn}^{2+}, \mathrm{V}^{2+}, \mathrm{Ni}^{2+}$, and $\mathrm{Ti}^{2+}$, the cation having the highest hydration energy to form aqua complex $\left[\mathrm{M}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$ is

• A

  $\mathrm{Mn}^{2+}$
• B

  $\mathrm{V}^{2+}$
• Correct answer
  C

  $\mathrm{Ni}^{2+}$
• D

  $\mathrm{Ti}^{2+}$

Hence, the correct answer is option: 'C'.