Hydrogen bonds are formed in many compounds H₂O,HF, NH₃. The boiling point of such compounds depends to a extent on the strength of hydrogen bond and the number of  hydrogen bonds. The correct decreasing order of the boiling points above compounds is

Strength of H-bond is in the order
H...F> H...O>H...N.
But each H₂O molecule is linked to four other H₂O molecules through H-bond whereas each HF molecule is linked only to two other HF molecules.
Hence, boiling point of H₂O > boiling point of HF > boiling point of NH₃.