We have to determine which of the given solids will have the lowest melting point.
The melting point of a solid depends upon the strength of intermolecular forces.
Solids with strong intermolecular forces have high melting points.
We will determine the type of intermolecular forces in each molecule.
Recall that there are several types of intermolecular forces:
1. Ion-dipole interaction – occurs between an ion and a polar covalent compound
2. Hydrogen bonding – occurs in compounds where hydrogen is directly connected to an electronegative element such as N, O, or F
3. Dipole-dipole interaction – occurs between two polar covalent compounds
4. Induced-dipole interaction – occurs when a nonpolar compound interacts with a polar compound
5. Dispersion forces – occurs in all compounds. This is the primary intermolecular force exhibited by nonpolar compounds.
Of the following pair of solids, which one has the higher melting point: CCl4(s) or SiCl4(s)?