Final answer:
Liquid pentanol exhibits London dispersion forces, dipole-dipole interactions, and particularly strong hydrogen bonding due to its -OH group.
Step-by-step explanation:
In liquid pentanol, CH3CH2CH2CH2CH2OH, several types of intermolecular forces are present. These include London dispersion forces, which are present in all molecules and increase in strength with the size of the molecule. Pentanol, having a longer carbon chain, would exhibit significant dispersion forces. In addition to dispersion forces, pentanol also exhibits dipole-dipole interactions due to its polar nature. The presence of an -OH group in pentanol also allows for the strongest intermolecular force, hydrogen bonding, which greatly affects the boiling point and other physical properties of the alcohol.