Final answer:
The forces between molecules are strongest in H2O (water) due to hydrogen bonding. The other gases listed have weaker dispersion forces.
Step-by-step explanation:
The forces between molecules are strongest in H₂O (water). Water molecules are attracted to each other by relatively strong hydrogen bonds. This makes water have a higher boiling point and stronger intermolecular forces compared to the other gases listed.
Hydrogen bonding is a special type of intermolecular force that occurs when a hydrogen atom is bonded to an electronegative atom (like oxygen or nitrogen) and is attracted to another electronegative atom.
The other gases listed, Ne (neon), CH₄ (methane), and O₂ (oxygen), primarily have weaker dispersion forces as their dominant intermolecular forces.