The compound with the higher boiling point written first in each pair is
Boiling point is influenced by intermolecular forces. Stronger intermolecular forces require more energy to overcome, resulting in a higher boiling point. All molecules experience these weak attractive forces due to temporary dipoles induced by electron movement. However, the strength of these forces depends on the size and polarizability of the molecules.
both are methane derivatives with tetrahedral geometry.
has larger chlorine atoms compared to hydrogen in
, leading to slightly stronger London dispersion forces due to increased surface area and electron cloud distortion.