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Multiple Choice
Which of the following is the weakest intermolecular force in the presence of water?
A
Dipole-dipole interactions
B
London dispersion forces
C
Ion-dipole interactions
D
Hydrogen bonding
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1
Identify the types of intermolecular forces listed: dipole-dipole interactions, London dispersion forces, ion-dipole interactions, and hydrogen bonding.
Recall that the strength of intermolecular forces generally follows this order: ion-dipole interactions > hydrogen bonding > dipole-dipole interactions > London dispersion forces.
Understand that in the presence of water, which is a highly polar molecule capable of hydrogen bonding and ion-dipole interactions, the forces involving ions and hydrogen bonds are stronger.
Recognize that London dispersion forces are the weakest because they arise from temporary fluctuations in electron distribution and are present in all molecules but are especially weak compared to the other forces listed.
Conclude that among the options given, London dispersion forces represent the weakest intermolecular force in the presence of water.