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The boiling point of n-octane is 126 degrees C. What is the expected boiling point of n-nonane?

A) 126 degrees C
B) Less than 126 degrees C
C) More than 126 degrees C
D) Cannot be determined

Answer :

Final answer:

The expected boiling point of n-nonane is (C) more than 126 degrees C because it has a longer carbon chain than n-octane, leading to stronger van der Waals interactions.

Explanation:

The expected boiling point of n-nonane is more than 126 degrees C. This is because in general, as the size of the hydrocarbon chain increases, the boiling point tends to increase as well.

The increased molecular size leads to greater van der Waals forces, which are a type of intermolecular interaction. These forces are stronger in n-nonane than in n-octane due to the additional CH2 group in n-nonane that increases its surface area and the possible van der Waals interactions.

Therefore, the choice C) More than 126 degrees C is the correct answer. The actual boiling point of n-nonane is 150.8°C, further substantiating the explanation for its higher boiling point compared to n-octane which has a boiling point of 125.7°C.

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