What happens to Van der Waals interactions when two molecules get too close?
They turn repulsive correctly describes the effect or change asked about in this question. In Chemical Bonding, understanding cause-and-effect relationships is essential for predicting biological outcomes. They turn repulsive occurs because of specific molecular interactions, thermodynamic principles, or regulatory mechanisms that govern this biological process. The other options (They become stronger, They remain unchanged, and They turn into hydrogen bonds) describe either opposite effects, effects that occur under different conditions, or changes associated with unrelated processes.
Ref: Campbell Biology, Urry et al., 12th Ed.
