Based on lattice energy and other consideration which one of the following alkali metal chloride is expected to have highest melting point?
The correct option is B $$NaCl$$
In case of halides of alkali metals, melting point decreases going down the group because lattice enthalpies decreases as size of alkali metal increases. But LiCl has lower melting point in comparison to NaCl due to covalent nature. Thus, NaCl is expected to have the highest melting point among given halides