As size of a molecule increases London Dispersion Forces increase.

Question

BlackTom AI · Accepted Answer

The statement to evaluate is: 'As size of a molecule increases London Dispersion Forces increase.'

Option 1 (True): This aligns with fundamental physical chemistry. London dispersion forces arise from instantaneous dipoles caused by fluctuations in electron distribution, and their magnitude grows with greater polarizability. As molecular size increases, there are more electrons and a larger, more easily distorted electron cloud, which enhances these instantaneous dipoles. Additionally, larger molecules typically have a bigger surface area that allows more favorable temporary interactions. Therefore, larger molecules generally experience stronger London dispersion forces.

Option 2 (False): If one claimed that London dispersion forces do not increase with molecular size, this would contradict the underlying principle that polarizability and the number of accessible electronic states rise with size. While it is true that other factors (shape, branching, rigidity) can modulate intermolecular interactions and affect measurable properties like boiling points, the broad trend with increasing molecular size is an increase in dispersion forces. Thus this option misstates the general relationship.

In summary, the reasoning supports that dispersion forces tend to strengthen as molecular size grows, though structural nuances can influence the magnitude in specific cases.

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

As size of a molecule increases London Dispersion Forces increase.

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