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Q.
Amongst $ LiCl, RbCl, BeCl_2$ and $ MgCl_2, $ the compounds with greatest and the least ionic character, respectively are
The s-Block Elements
Solution:
Smaller cation with large magnitude of charge $ (Be^{2+})$ leads to more covalent character i.e., less ionic character and large cation with small magnitude of charge $(Rb^+)$ leads to less covalent character i.e., more ionic character according to Fajan rule. Thus $RbCl$ is most ionic and $BeCl_2 $ is least ionic.