Here's why:

* Hydrogen bonding occurs when a hydrogen atom is bonded to a highly electronegative atom (like oxygen, nitrogen, or fluorine). This creates a strong dipole moment, allowing the hydrogen to form a weak interaction with a lone pair of electrons on another electronegative atom.

* Chlorine is less electronegative than oxygen, nitrogen, or fluorine. While chlorine can form polar covalent bonds, the electronegativity difference between chlorine and hydrogen is not large enough to create the strong dipole needed for hydrogen bonding.

Therefore, chlorine does not participate in hydrogen bond formation.