Amongst LiCl, RbCl, BeCl 2 and MgCl 2 the compounds with the greatest and the least ionic character, respectively are :

Step-by-step solution

(i) % Ionic character = 16(X A – X B ) + 3.5 (X A – X B ) 2 X Rb = 0 · 8 , X Cl = 3 · 0 , X Be = 2 For Rb and Cl the electronegativity difference is highest so having more ionic character. For Be   and   Cl , electronegativity difference is the lowest so having less ionic character Covalent character in compound depends upon the charge and size of ions. As charge in cation increases, covalent character increases and as size of cation increases covalent character decreases. Charge fac