Statement-I : Lithium reacts with water more vigorously than sodiumStatement-II : Lithium  possesses small size and very high hydration energyThe correct answer is

As the size of metal increases electron losing tendency increases and hence chemical reactivity increases Reactivity with waterNa > LiHydration enthalpy: [HE]   Size of M+ ions : Li+ < Na+ < K+ < Rb+ < Cs+H.E Order  : Li+>Na+>K+>Rb+>Cs+As the size of M+ ion increases, Nuclear charge decreases and hence attractive forces on the water molecule decreases, and hence degree of hydration decreasesTherefore hydration energy decreasesi.e Li+ ion has highest hydration energysublimation energy (S.E) & Ionisation energies [IE] are absorbed energies,where as hydration energy [H.E] is released energyIn the case of Li As high H.E of "Li" it can easily gives the electrons in large number, therefore it can acts as strongest. Reducing agent inaqueous solutions among [alkali] metals in the periodic table.