$\rm{-37.6^{\circ} \, C}$

$\rm{-97.6^{\circ} \, C}$

$\rm{-64.7^{\circ} \, C}$

$\rm{-94.6^{\circ} \, C}$

Primary butyl alcohol

Secondary butyl alcohol

Tertiary butyl alcohol

Quaternary butyl alcohol