
Concept explainers
Interpretation:
The compound that is most likely existing as liquid in room temperature, has to be found out among the given options.
Concept Introduction:
Melting point is the point at which the solid phase and the liquid phase of a compound exists in equilibrium.
For a compound to exist as a liquid readily at room temperature, then it should have a low melting point. To have a low melting point, the compound should have poor intermolecular forces among its molecules, for which the molar mass of the compound should be the least value.
Dispersion forces are the major intermolecular forces that govern the trends of melting and boiling points.
Dispersion forces: The electronic distribution in one molecule induces an instantaneous dipole moment in it. This instantaneous dipole moment in each molecule creates a temporary dipole moment among the surrounding molecules. Such an interaction is the dispersion force.
So, the dispersion force will be greater in the compounds with more electronic distribution which implies the compounds with large molar mass. In contrast, it will be smaller in the compounds with small molar mass since those compounds have less electronic distribution.

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Chapter 12 Solutions
General Chemistry
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