Boiling Point Temps N2, NO2, NO

[Erika Patel 3I]

What would be the order of increasing boiling point temperatures for N2, NO2 and NO? I understand that N2 would have the lowest boiling point because it only experiences LDFs, however I am not sure how to differentiate NO2 and NO since both experience dipole-dipole interactions.

[jedricgonzales2I]

Nitrogen dioxide has a greater boiling point than nitric oxide. Since nitrogen dioxide has two oxygens, there is greater electron density pulled from the nitrogen. Thus, nitrogen dioxide experiences greater dipole-dipole forces compared to nitric oxide.

[106046096]

Hi! Yes, N2 will have only LDFs present and thus have the lowest boiling point. However, the difference between NO and NO2 is that NO has a single bond between the N-O and NO2 will have a double bond and a single bond present between the N-O. Because of the double bond, NO2 will experience a stronger IMF between the N-O and have the highest boiling point overall. Therefore, the order of increasing boiling point temperatures will be N2 < NO < NO2.