What has a higher boiling point alkane, alkene, or alkyne?

Answer 1

Well, we might think that the heaviest molecule would have the highest boiling point....

So let's look at the normal boiling points of the alkane versus olefin versus acetylene series. And why would we think so? Well, because the heavier molecule has to have more electrons, which means more opportunity for dispersion forces.

#"Ethane, ethylene, acetylene:"-89""^@C; -103.7^@C; -84""^@C#...
#"Propane, propylene, propyne:"-42""^@C; -47.6^@C; -23.2""^@C#...
#"Butane, 1-butene, 1-butyne:"0""^@C; -6.3^@C; 8.1""^@C#...

I suggest an additional contribution to the intermolecular force, i.e. bond polarity, which should dominate for the acetylene derivative, i.e. there is more charge separation for acetylene, which expresses itself as an intermolecular force. And our facile expectation was indeed justified for the alkane, versus the corresponding olefin...but the acetylene was more involatile, even though it was the lightest molecule in the series.

Furthermore, keep in mind that while you must be able to interpret these volatility values, you are not required to remember them.

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Answer 2

Alkynes have higher boiling points than alkenes, and alkenes have higher boiling points than alkanes.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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