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Which of the following compounds has the lowest boiling point?

1. CH3CH2CH2CH2CH3
2. CH3CH2CH=CH2
3. CH3CH=CH—CH=CH2
4. CH3CH2CH2CH3

Correct answer: CH3CH=CH—CH=CH2

Solution

The compound with the lowest boiling point is the one with the least number of hydrogen bonds.

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