Two compounds, A and B, have the molecular formula C₃H₉N. One isomer has no hydrogen atoms bonded to the nitrogen atom and has a boiling point of 2.9 °C. The other isomer (boiling point of 47.8 °C) has two hydrogen atoms bonded to the nitrogen atom, and the carbon atoms and nitrogen atom are in a straight chain. Neither structure contains a ring. Draw the Lewis structure of both compounds. Compare the types of intermolecular forces for each and use them to explain the differences in the boiling point of the two compounds.