Use the Following Equation for Questions

-The $\alpha$

Use the following equation for questions

-The relative size of the Van der Waals constant, $\alpha$ , correlates well with boiling point; that is, the larger $\alpha$ is, the higher the boiling point. The reason for this correlation is

A) the $\alpha$ constant is a measure of molecular size.
B) the boiling point is directly proportional to $\alpha$ .
C) the $\alpha$ constant varies with temperature.
D) the $\alpha$ constant is a measure of intermolecular force strength.
E) the $\alpha$ constant varies with vapour pressure.