Which of the following is least ionic ?

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${CaF}_{2}$

${CaCl}_{2}$

${CaBr}_{2}$

${CaI}_{2}$

answer is D.

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Detailed Solution

According to Fajan's rule, the larger the size of the anion, greater is the covalent character of the ionic bond.
Size of iodine is the largest among the halogens, therefore it has more covalent character or less ionic character.

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