Answer:
HF
Explanations:
A hydrogen bond is defined as an electrostatic force of attraction that exists between a hydrogen atom and a more electronegative atom with another electronegative atom having a lone pair of electrons.
From the given molecule, the molecule that would have the strongest tendency to form hydrogen bonds with other identical molecules is HF. This is due to the high electronegative nature of fluorine atoms.
Other elements that hydrogen bonds form with are nitrogen and oxygen
Also, HF has three lone pairs on the F atom but only one H atom can form only two bonds