The incorrect order of lattice energy is

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(C) The lattice energy $(LE)$ is directly proportional to the product of the charges of the ions and inversely proportional to the sum of their ionic

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$NaCl > LiF$

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(C) The lattice energy $(LE)$ is directly proportional to the product of the charges of the ions and inversely proportional to the sum of their ionic radii: $LE \propto \frac{q^+ \cdot q^-}{r^+ + r^-}$.$A) AlF_3 > MgF_2$: $Al^{3+}$ has a higher charge than $Mg^{2+}$,so $AlF_3$ has higher lattice energy.$B) Li_3N > Li_2O$: $N^{3-}$ has a higher charge than $O^{2-}$,so $Li_3N$ has higher lattice energy.$C) NaCl > LiF$: The ionic radii of $Li^+$ and $F^-$ are smaller than those of $Na^+$ and $Cl^-$. Therefore,$LiF$ should have higher lattice energy than $NaCl$. The given order $NaCl > LiF$ is incorrect.$D) TiC > ScN$: $Ti^{4+}C^{4-}$ has higher charges than $Sc^{3+}N^{3-}$,resulting in higher lattice energy for $TiC$.Thus,the incorrect order is $NaCl > LiF$.

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