Forces of Attraction

Two molecules of CH4O adjacent to each other would exhibit all three forces of attraction, London Dispersion Forces, Dipole-Dipole, and Hydrogen Bonding.

London Dispersion Forces is the force of attraction between two molecules created by temporary dipoles, which are caused by the movement of electrons around 2 atoms in a molecule. This force is always present, even between two non-polar molecules.

Two CH4O molecules would also exhibit dipole-dipole, an electrostatic attraction caused by the positive end of one dipole being attracted to the negative end of another dipole. In CH4O, the negative oxygen atom of the molecule would be attracted to one of the Hydrogens of the other.

Hydrogen bonding, the third force of attraction two CH4O molecules would exhibit, is a special case of dipole-dipole in which a temporary covalent bond forms between the Hydrogen of one molecule and the Oxygen, Nitrogen, and Fluorine of an adjacent molecule. In two adjacent molecules of CH4O, a temporary covalent bond could from between any of the four hydrogens of one molecule and the oxygen of the other, either the ones bonded to the carbon or the one bonded to oxygen.