Which statement best describes hydrogen bonds compared to covalent bonds?

Which statement best describes hydrogen bonds compared to covalent bonds?

• A. Hydrogen bonds are weaker than covalent bonds and involve attraction between a hydrogen atom and electronegative atoms.
• B. Hydrogen bonds involve sharing electrons between atoms.
• C. Hydrogen bonds are stronger than covalent bonds.
• D. Hydrogen bonds require metallic bonding.

Answer: (A)

Hydrogen bonds are weaker interactions that form an electrostatic attraction, not a sharing of electrons. When hydrogen is covalently bonded to a highly electronegative atom like oxygen, nitrogen, or fluorine, the hydrogen ends up with a partial positive charge. That positively charged hydrogen can be attracted to a lone pair on another electronegative atom in a different molecule, creating a hydrogen bond. This is why hydrogen bonds are much weaker than covalent bonds, which involve actual sharing of electrons to form strong, localized bonds within or between atoms. In numbers, hydrogen bonds are typically in the range of a few to a few tens of kilojoules per mole, whereas covalent bonds are hundreds of kilojoules per mole. Hydrogen bonds are not about sharing electrons, nor do they involve metallic bonding, and this weaker, directional interaction explains their crucial role in properties like water’s behavior and the structure of DNA.

Hydrogen bonds are weaker interactions that form an electrostatic attraction, not a sharing of electrons. When hydrogen is covalently bonded to a highly electronegative atom like oxygen, nitrogen, or fluorine, the hydrogen ends up with a partial positive charge. That positively charged hydrogen can be attracted to a lone pair on another electronegative atom in a different molecule, creating a hydrogen bond. This is why hydrogen bonds are much weaker than covalent bonds, which involve actual sharing of electrons to form strong, localized bonds within or between atoms. In numbers, hydrogen bonds are typically in the range of a few to a few tens of kilojoules per mole, whereas covalent bonds are hundreds of kilojoules per mole. Hydrogen bonds are not about sharing electrons, nor do they involve metallic bonding, and this weaker, directional interaction explains their crucial role in properties like water’s behavior and the structure of DNA.