According to Fajan rules , the percentage of covalent character in an ionic compound increases . If the cation is highly charged or the cation is small and the anion is large or the cation has pseudo inert gas configuration . As a result of increased covalent character , the melting point decreases and solubility in less polar solvent increases . The correct order of increasing ionic character is

According to Fajan rules , the percentage of covalent character in an

1.	According to Fajan rules , the percentage of covalent character in an ionic compound increases . If the cation is highly charged or the cation is small and the anion is large or the cation has pseudo inert gas configuration . As a result of increased covalent character , the melting point decreases and solubility in less polar solvent increases . The correct order of increasing ionic character is
Answer» `BeCl_(2) lt MgCl_(2) lt CaCl_(2) lt BaCl_(2)` `BeCl_(2) lt MgCl_(2) lt BaCl_(2) lt CaCl_(2)` `BeCl_(2)lt BaCl_(2) lt MgCl_(2) lt CaCl_(2)` `BaCl_(2) lt CaCl_(2) lt MgCl_(2) lt BeCl_(2)` Solution :As the size of the CATION increases , electronegativity decreases but the electronegativity DIFFERENCE increases and hence IONIC CHARACTER increases accordingly , i.e., option (a) is correct .