Chemistry Multiple Choice

Chemistry Multiple Choice-50
Even though our TFP has more polar C-F bonds, it actually has a lower boiling point, so this observation, which is true, still doesn't explain what we're trying to explain.(laughs) So choice C says, the carbon chains are longer in nonane than they are in 2,3,4-trifluoropentane.When something boils, you're not actually breaking any of the covalent bonds, so that doesn't explain anything about the boiling point.

Even though our TFP has more polar C-F bonds, it actually has a lower boiling point, so this observation, which is true, still doesn't explain what we're trying to explain.(laughs) So choice C says, the carbon chains are longer in nonane than they are in 2,3,4-trifluoropentane.When something boils, you're not actually breaking any of the covalent bonds, so that doesn't explain anything about the boiling point.

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So, answer choice A says, the carbon-fluorine bond is easier to break than the carbon-hydrogen bond.

And we know this is a wrong answer, because this has nothing to do with intermolecular forces.

So if we just look at the pictures here of the structures, this is also true.

In nonane we have these one, two, three, four, five, six, seven, eight, nine carbons.So, we're saying, okay, this has a longer chain.Therefore, it will have more London dispersion forces because these molecules are better able to interact with each other with their instantaneous dipoles, and that means these forces go up and the boiling point should go up, and that's what we're trying to explain.If the carbon chains are further apart in nonane, further apart would mean, the further apart they are, the weaker the intermolecular forces.So this would mean, nonane has weaker intermolecular forces, and that would suggest it would have a lower boiling point. And again, this is not what we're trying to explain.So a higher boiling point means that you have more intermolecular forces to overcome.So what we're really asking here is, which of these answer choices explains why nonane has more intermolecular forces amongst the molecules, compared to TFP?So we can see that nonane has a boiling point of 151, versus 89 Celsius for our TFP.Which of the following statements best helps explain this observation?We have nine carbons versus one, two, three, four, five carbons. We know that even though the molar mass here is the same, the length of the chain is actually related to the London dispersion forces.So as the length of the chain goes up, that actually means that the London dispersion forces, so the intermolecular forces that happen when you get these tiny instantaneous dipoles, those forces also go up.

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