One would expect proton to have very large

The proton (H⁺), due to its extremely small ionic radius, exhibits a significantly high hydration energy. This phenomenon can be comprehended through the following key points:

• Small Ionic Radius: The proton's diminutive size leads to a high charge density, which intensifies its electrostatic attraction to water molecules.
• Strong Electrostatic Attraction: The substantial charge density of the proton attracts the partial negative charge on the oxygen atoms of water molecules, resulting in a robust ion-dipole interaction.
• Hydration Energy and Ionic Size Relationship: Hydration energy is inversely proportional to the ionic radius. Therefore, smaller ions like the proton have higher hydration energies.

Consequently, among the given options, one would expect the proton to have a very large hydration energy.