• # question_answer mongst $LiCl,\ RbCl,\ BeC{{l}_{2}}$ and $MgC{{l}_{2}}$the compounds with the greatest and least ionic character respectively are [Pb. CET 2004] A) $LiCl$ and $RbCl$ B) $MgC{{l}_{2}}$and $BeC{{l}_{2}}$ C) $RbCl$ and $BeC{{l}_{2}}$ D) $RbCl$ and $MgC{{l}_{2}}$

According to Fajan's rule RbCl has greatest ionic character due to large ionic size of $R{{b}^{+}}$ ion. $BeC{{l}_{2}}$ has least ionic (Maximum covalent) due to small size of $B{{e}^{+2}}$ ion which has highly polarising.