If H2CO was bonded to itself, the forces of attraction involved would be:
London Dispersion Forces
Very weak attraction forces due to the constant movement of electrons around atoms.
Dipole - Dipole Attraction Forces
An electro-static attraction between the positive end of a molecule and the negative end of another. [represented by a dotted line]
O = C -- H - - - - - - O = C -- H
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H H
Hydrogen Bond
A covalent bond temporarily forms between a hydrogen (H) and either a nitrogen (N), oxygen (O), or a fluorine (F). [represented by a solid line]
O = C -- H --------- O = C -- H
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H H
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