It is said that Hydrogen bonding effects are especially pronounced in water because water has two hydrogen atoms and two unshared elctron pairs ,giving each molecule the oppertunity to participate in four hydrogen bonds. But HF also has oppertunity to participate in four hydrogen
bonds but even then it has much lower boiling point than water. HF also has lower melting point than water. Can you explain why? I'm first year college student. Thank you

Sincerely,
Vijay

Each HF molecule may have the opportunity to participate in 4 bonds, but it can't find things to bond with. In H₂O, the number of hydrogen atoms and unshared electron pairs are exactly matched. In HF, they are not. Although HF has extra electrons ready for bonding, there aren't enough hydrogens to bond to them.

Each HF molecule may have the opportunity to participate in 4 bonds, but it can't find things to bond with. In H₂O, the number of hydrogen atoms and unshared electron pairs are exactly matched. In HF, they are not. Although HF has extra electrons ready for bonding, there aren't enough hydrogens to bond to them.