Question

Which functional groups are not able to form hydrogen bonds and why?

Answer 1

Those without any hydrogen atoms (adjacent to electronegative elements) and strongly electronegative elements (F, O, N, Cl).

Explanation:

The hydrogen bond is really a special case of dipole forces. A hydrogen bond is the attractive force between the H attached to an electronegative atom of one molecule and an electronegative atom of a different molecule. Usually the electronegative atom is O, N, or F, which has a partial negative charge. The H then has the partial positive charge.