The setting of Plaster of Paris is associated with which of the following?

In context with beryllium,which one of the following statements is incorrect?

Alkaline earth metals (except $Be$) can easily lose their valence electrons,so how do they behave?

The tendency of forming chloride hydrates of alkaline earth metals is in the order of

Compare the properties of beryllium with other alkaline earth metal elements.

Given below are two statements,one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A:$ Beryllium has a less negative value of reduction potential compared to the other alkaline earth metals.
Reason $R:$ Beryllium has large hydration energy due to the small size of $Be^{2+}$ but a relatively large value of atomization enthalpy.
In the light of the above statements,choose the most appropriate answer from the options given below.