Which interaction(s) exist(s) between CO molecules?
A) I only
B) II only
C) IV only
D) I and II
E) I and IV

Question

Which interaction(s) exist(s) between CO molecules? 
A) I only 
B) II only 
C) IV only 
D) I and II 
E) I and IV

Quizplus · Accepted Answer

Interaction I refers to London dispersion forces, which exist between all molecules. Interaction IV refers to dipole-dipole interactions, which occur between polar molecules. CO is a polar molecule with a permanent dipole moment; therefore, it can experience dipole-dipole interactions. Additionally, CO can also exhibit London dispersion forces. Therefore, the correct answer is E, as both interaction I (dispersion forces) and IV (dipole-dipole interactions) exist between CO molecules.

Which Interaction(s) Exist(s) Between CO Molecules