why does lithium react with hydrated chloride while sodium , cesium cannot

Q. Solid sodium chloride does not conduct electricity while sodium chloride solution conducts. Explain why.

Q. Which of the following statements are correct?
(a) Lithium has the highest hydration enthalpy among the alkali metals.
(b) Lithium chloride is insoluble in pyridine
(c) Lithium can not form ethynide upon its reaction with ethyne.
(d) Both lithium and magnesium react slowly with $H_{2}O$

Q. Why does cesium $\left(Cs\right)$ have a larger atomic radius than lithium $\left(Li\right)$?