Which of the following is more ionic in nature?

C u F_{2}

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C u C l_{2}

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C u B r_{2}

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None of these

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Solution

The correct option is A $C u F_{2}$
Fajan's rule states that the ionic compound will be formed most easily when a small atom forms the anion and a large atom forms the cation. Here, smallest anion is $F^{-}$ .
Hence, $C u F_{2}$ has maximum ionic nature according to Fajan's rule.

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C u F_{2}, C u C l_{2}

C u B r_{2}

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