H2O will have more strongest bond, because H will form H-bond with O therefore H2O will have strongest bond.

Hydrogen Bonding in Different Substances

Introduction:
Hydrogen bonding is a special type of intermolecular force that occurs between a hydrogen atom bonded to an electronegative atom and another electronegative atom. This bond is stronger than the usual dipole-dipole interactions between molecules. In this response, we will compare the strength of hydrogen bonding in four substances: HCl, H2O, HL, and H2S.

1. HCl:
Hydrogen bonding occurs when hydrogen is bonded to a highly electronegative atom like oxygen, nitrogen, or fluorine. In the case of HCl, hydrogen is bonded to chlorine, which is less electronegative than oxygen or nitrogen. Therefore, HCl does not exhibit hydrogen bonding. Instead, it forms dipole-dipole interactions between its molecules.

2. H2O:
Water (H2O) is known for its strong hydrogen bonding. Each water molecule can form hydrogen bonds with up to four neighboring water molecules. The oxygen atom in water is highly electronegative, and the hydrogen atoms are positively charged. This polarity allows for the formation of strong hydrogen bonds, resulting in unique properties of water such as high boiling point and surface tension.

3. HL:
In this case, the substance HL is not specified, so we cannot determine its hydrogen bonding strength. However, if HL represents an acid, such as hydrochloric acid (HCl), as mentioned earlier, it does not exhibit hydrogen bonding. If HL represents an alcohol like ethanol (CH3CH2OH), it can form hydrogen bonds between the hydrogen atom of one molecule and the oxygen atom of another molecule.

4. H2S:
Hydrogen sulfide (H2S) is similar to water in terms of its molecular structure, with sulfur replacing oxygen. However, sulfur is less electronegative than oxygen, resulting in weaker hydrogen bonding in H2S compared to H2O. Sulfur's larger atomic size also contributes to the weaker hydrogen bonding in H2S.

Conclusion:
Based on the comparison, it is clear that the substance with the strongest hydrogen bonding is H2O (water). The strong electronegativity of oxygen and the small size of its atom contribute to the formation of strong hydrogen bonds. HCl does not exhibit hydrogen bonding, while HL and H2S have weaker hydrogen bonding due to the lower electronegativity of the atoms involved.