Identify the correct statement from the following.

Lithium and Magnesium show some similarities in their physical properties as they are diagonally placed in periodic table.

Lithium is softer among all alkali metals.

Lithium chloride is deliquescent and crystallises as a hydrate, $\displaystyle \mathrm{LiCl} \cdot \mathrm{H}_2 \mathrm{O}$.

The order of hydration enthalpies of alkaline earth cations $$\mathrm{Be}^{2+}<\mathrm{Mg}^{2+}<\mathrm{Ca}^{2+}<\mathrm{Sr}^{2+}<\mathrm{Ba}^{2+} $$