Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point

Options

A. `LiCl`
B. `NaCl`
C. `KCl`
D. `RbCl`

Answer

B

Explanation

Although lattice energy of `LiCl` higher than `NaCl` but `LiCl` is covalent in nature and `NaCl` ionic there, after, the melting point decreases as we move `NaCl` because the lattice energy decreases as a size of alkali metal atom increases (lattice energy `prop` melting point of alkali metal halide)