Which compound has the lowest melting point?

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(A) The melting point of alkali metal halides is determined by the nature of the bond and lattice energy.$LiCl$ exhibits significant covalent characte

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$LiCl$

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(A) The melting point of alkali metal halides is determined by the nature of the bond and lattice energy.$LiCl$ exhibits significant covalent character due to the high polarizing power of the small $Li^+$ ion (Fajans' rule).In contrast,$NaCl$,$KCl$,$RbCl$,and $CsCl$ are predominantly ionic,and their melting points are governed by their lattice energy.Since $LiCl$ is predominantly covalent,it has the lowest melting point among the given options.

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