Strongest hydrogen bond is:

Explanation

Hydrogen fluoride (HF) has the strongest hydrogen bond. This is because fluorine is the most electronegative element of the three, meaning it has a greater tendency to attract electrons. This makes the hydrogen bond in HF more polar, and therefore stronger. The strength of a hydrogen bond is determined by a number of factors, including the electronegativity of the atoms involved, the distance between the atoms, and the size of the atoms. In general, hydrogen bonds are stronger when the atoms involved are more electronegative, when the distance between the atoms is shorter, and when the atoms are smaller. In the case of HF, fluorine is the most electronegative element, the distance between the hydrogen and fluorine atoms is short, and the fluorine atom is small. This makes the hydrogen bond in HF the strongest of the three.