consider-the-substances-below-that-have-a-liquid-crystal-state-which-compound-wi

Question

Consider the substances below that have a liquid crystal state. Which compound will have a solid-to-liquid crystal phase change at a higher temperature and why?

Diagram comparing solid-to-liquid crystal phase changes of two compounds in chemistry.

Accepted Answer

Compound I will have a solid-to-liquid crystal phase change at a higher temperature because it has both stronger London dispersion forces (longer) and dipole-dipole forces.

Answer

Compound II will have a solid-to-liquid crystal phase change at a higher temperature because it has weaker stronger London dispersion forces (shorter) and no dipole-dipole forces.