Which of the following order !s correct for lattice energy of ionic solids?

For compounds containing ions of same charge lattice energy increases as the size of ions decreases. Thus NaF has highest lattice energy. The order is LiF, NaF, KF, RbF and CsF in increasing order of their lattice energies.

$\mathrm{LiF}>\mathrm{NaF}>\mathrm{KF}>\mathrm{RbF}$