Compared to alkaline earth metals,what do alkali metals exhibit?

Which of the following statements is incorrect for alkali metals?

Calcium is obtained by

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: $LiF$ is sparingly soluble in water.
Reason $R$: The ionic radius of $Li^{+}$ ion is smallest among its group members,hence it has the least hydration enthalpy.
In the light of the above statements,choose the most appropriate answer from the options given below.

Which of the following represents the correct order of hydration energy?

The lightest metal is