What type of inter-molecular force arises from instantaneous dipole moments?

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Question restated: What type of inter-molecular force arises from instantaneous dipole moments?

Option 1: ion-induce dipoles. This force involves a charged ion inducing a dipole in a nearby nonpolar molecule, which is not the same as forces arising from instantaneous dipole moments in molecules themselves. It combines ion-induced effects with dipole formation, so it does not describe the general instantaneous dipole phenomenon.

Option 2: hydrogen bonding. Hydrogen bonds are a specific strong type of dipole-dipole interaction that occurs when hydrogen is bonded to highly electronegative atoms like N, O, or F. They rely on permanent dipoles and specific bonding partners, not on instantaneous dipoles generated randomly.

Option 3: dipole-dipole bond. This term refers to interactions between permanent dipoles in polar molecules. While dipole-dipole attractions are real, they originate from fixed molecular dipoles, not from transient, instantaneous ones.

Option 4: London Dispersion Forces. These arise from temporary, instantaneous dipoles caused by fluctuations in electron distribution within atoms or nonpolar molecules. Accessory dipoles induce neighboring dipoles, creating a mild, short-range attraction that is universal, including in noble gases and nonpolar substances.

Option 5: ion-dipole interactions. This is the attraction between a charged ion and a permanent dipole in a polar molecule. It involves ionic charge and a pre-existing dipole, not instantaneous dipole moments as the primary source.

In summary, the concept described—forces from fleeting, momentary dipoles in atoms or molecules—aligns with London dispersion forces, which are also known as instantaneous-dipole-induced dipole interactions. The other options either involve permanent dipoles, specific bonding scenarios, or ion-related effects that do not capture the instantaneous dipole mechanism.

CHEM 110 Section 3 (PM) SP25 Pre-Lecture 24 Quiz C11-1-5

What type of inter-molecular force arises from instantaneous dipole moments?

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