Explain in terms of intermolecular forces why isomer 2 boils at a lower temperature than isomer 1

Answer is: because isomer 2 has weaker intermolecular forces.

Intermolecular forces are the forces between molecules. The stronger are intermolecular forces, the higher is boiling point of compound, because more energy is needed to break interaction between molecules.
There are several types of intermolecular forces: hydrogen bonding, ion-induced dipole forces, ion-dipole forces andvan der Waals forces.