Beryllium has a less negative value of reduction potentials compared to other alkaline earth metals due to:

Consider the following statements;

${\mathbf{S}}_1:$ Alkali metals are never found in free state in nature.

${\mathbf{S}}_2:$ The melting and boiling points of alkali metals are high. 

${\mathbf{S}}_3:$ The caesium and potassium both are used as electrodes in photoelectric cells.

${\mathbf{S}}_4:$ Alkali metals are normally kept in kerosene oil.

and arrange in the order of true/false.