The product, which is not obtained during the electrolysis of brine solution is :

Ion having highest hydration enthalpy among the given alkaline earth metal ions is :

Structures of $$\mathrm{BeCl}_{2}$$ in solid state, vapour phase and at very high temperature respectively are :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Gypsum is used for making fireproof wall boards.

Reason (R) : Gypsum is unstable at high temperatures.

In the light of the above statements, choose the correct answer from the options given below :