If ionisation energy of an element is as follows :

X → X⁺ + 1e^–; 1E₁ = x kJ/mol

X⁺ → X²⁺ + 1e^– ; 1E₂ = 1.5 x kJ/mol

X²⁺ → X³⁺ + 1e^– ; IE₃ = 15x kJ/mol

This   element   may   have    the    electronic configuration :-

At 25°C the standard emf of cell having reactions involving two electrons change is found to be 0.295 V. The equilibrium constant of the reaction is :

Kindly consider the following 

Which of the following will not give ether as product :-

Which is most reactive towards electrophilic aromatic substitution reaction :-

Which one of the following ions is the most stable in aqueous solution ?

(At. No. Ti = 22, V = 23, Cr = 24, Mn=25)