From the substances provided below, choose the substance which has the strongest intermolecular forces.

Substance Vapor pressure at $20\backslash$deg C$,$ torr

pentane $()414\mathrm{.}5$

heptane $()37\mathrm{.}2$

$1-$butanol $()7\mathrm{.}1$

$1-$butanol $()$

heptane $()$

pentane $()$

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