Answer:
ethanol
Explanation:
the boiling and melting point directly proportional to the no. of polar hydroxyl group in the compound
Quartz has the highest melting point because it is a network solid.
The melting point of a solid gives us an idea of the kind of bonding that exists within the components solid.
The higher the melting point of the solid the stronger the interaction between the component particles that make up the solid.
Naphthalene, and methane are only held together by weak dispersion forces. The melting point of naphthalene is higher than that of methane because naphthalene has a higher molecular mass. Ethanol a lower melting point than naphthalene due to its low molecular mass irrespective of the presence of strong hydrogen bonding in the solid.
Quartz is a covalent network solid made up of SiO2 units. Covalent network solids are known to be strong and have high melting points because the sub-units are closely packed in the crystal.
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