Answer
At a given temperature, the liquids with the lowest boiling points have the weakest intermolecular forces and therefore, have the highest vapor pressure and vice versa.
Butane, $-0.5^{\circ}C$, has the lowest boiling point and toulene, $110.6^{\circ}C$ has the highest boiling point.
Therefore, butane has the highest vapor pressure and toluene has the lowest vapor pressure.
Work Step by Step
At a given temperature, the liquids with the lowest boiling points have the weakest intermolecular forces and therefore, have the highest vapor pressure and vice versa.
Butane, $-0.5^{\circ}C$, has the lowest boiling point and toulene, $110.6^{\circ}C$ has the highest boiling point.
Therefore, butane has the highest vapor pressure and toluene has the lowest vapor pressure.
