(B) According to Fajan's rule,the ionic character of a compound increases as the size of the cation increases.In Group $2$ elements,the size of the ca

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$BeCl_2 < MgCl_2 < CaCl_2 < BaCl_2$

(B) According to Fajan's rule,the ionic character of a compound increases as the size of the cation increases.In Group $2$ elements,the size of the cation increases as we move down the group: $Be^{2+} Therefore,the ionic character of their chlorides increases in the order: $BeCl_2 < MgCl_2 < CaCl_2 < BaCl_2$.