Final answer:
Based on the electronegativity differences, BA₂ has the highest dispersion forces followed by EF₂, and CD₂ has the lowest. Hence, the correct order from highest to lowest is BA₂, EF₂, CD₂.
Step-by-step explanation:
The question relates to the London dispersion forces present in molecules BA₂, CD₂, and EF₂, based on their electronegativity differences. London dispersion forces are one type of van der Waals force and are related to the size and polarizability of the molecules involved. Given that CD₂ has an electronegativity difference of 0, it will likely have no dipole and the weakest dispersion forces. EF₂ has a small difference of 0.2, indicating weak dipole-dipole interactions in addition to dispersion forces. BA₂ has a larger difference of 0.4 but still significantly less than 1.5, which would suggest significant ionic character according to the reference plot. Thus, it will have stronger London dispersion forces than EF₂.
Considering the information and the reference graph that discusses the percent ionic character and measured dipole moments, the list from highest to lowest dispersion forces would be: BA₂, EF₂, CD₂.
Therefore, the correct answer to list the molecular form from highest to lowest dispersion forces is option b) BA₂, EF₂, CD₂.