How do you tell whether an organic molecule will have a hydrogen bond or dipole dipole?

2 Answers

Relevance
  • 6 months ago

    Intermolecular attraction .....

    It's not necessarily an "either/or" question. If the molecule has hydrogen attached to N, O or F then it can exhibit hydrogen bonding. The molecule will probably be polar, as well. Therefore, it can exhibit hydrogen bonding AND Keesom forces (dipole-dipole attraction). But there will also be Debye forces (induced attraction) and London dispersion forces (which are always present). The hydrogen bond will be the strongest of the bunch.

    Of course, if there is no hydrogen bonding, and the molecule is polar, there will be Keesom forces (dipole-dipole attraction). There will also be Debye forces (induced attraction) and London dispersion forces (which are always present). In some molecules, particularly those with a high number of carbon atoms (and a high number of electrons), the London dispersion forces may be the strongest of the intermolecular attractions. (It is a common misconception that London dispersion forces are always the weakest.)

  • 6 months ago

    It will have hydrogen bonding if the H is bonded to either a N, O or F atom. It will be a dipole if the molecule has a separation of charge.

Still have questions? Get your answers by asking now.