Hydrogen bonds form between a hydrogen atom covalently bonded to an electronegative atom (such as N, O, or F) and another electronegative atom. Among the given molecules, the ones that can form hydrogen bonds are:

- CH3OH (methanol): The hydrogen atom in the O-H group can form hydrogen bonds with other electronegative atoms.

- CH3COOH (acetic acid): The hydrogen atom in the O-H group of the carboxylic acid group can form hydrogen bonds.

- HCL (hydrogen chloride): Although HCl is a gas at room temperature, it can form hydrogen bonds in its liquid or solid state. The hydrogen atom in the H-Cl bond can form hydrogen bonds with other electronegative atoms.

The other molecules, CH3Cl (chloromethane), C4H8 (butane), and Ph3 (triphenylphosphine), do not have hydrogen atoms bonded to highly electronegative atoms and therefore cannot participate in hydrogen bonding.