40. Which of the following statements regarding dispersion forces is false? a. E

Question

40. Which of the following statements regarding dispersion forces is false? a. Electrons in one molecule can experience attractions to nuclei in a neighboring nonbonded molecule. Temporary dipoles can arise when electrons are temporarily asymmetrically redistributed around the nucleus of an atom or within a bond. As electron cloud size increases, the strength of dispersion forces increases. The dipole moments associated with dispersion forces are long-lasting. Temporary dipoles can induce dipoles in other particles. b. c. d. e.

Explanation / Answer

Dispersion forces are present in all elements and compounds; they arise from the fluctuations in electron distribution within atoms and molecules. The electron in an atom or molecule may at any one instant, be unevenly distributed. So, one side of atom, which temporarily has no electrons, has a slightly positive charge and the other hand has a slightly negative charge. The charge separation is called an instantaneous dipole. The instantaneous dipole on one atom induces an instantaneous dipole on its neighboring atoms. A larger electron cloud results in a greater dispersion forces. These are the weakest intermolecular forces, but they are significant in molecules with high molar masses.

Therefore, the false statement is d. The dipole moments associated with dispersion forces are long-lasting.

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