Compound having least lattice energy is

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$NaF$

$KF$

$RbF$

$CsF$

answer is D.

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Detailed Solution

Cesium fluoride ( $CsF$ Compound having least lattice energy.

Because Cs is the least electronegative element that is not radioactive and F is the most electronegative element, $CsF$ is a nearly perfect ionic combination.

Hence, option D is correct.

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