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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 CH3CH=CH—CH=CH2 (option C) has the lowest boiling point because it is the most unsaturated, leading to weaker intermolecular forces (van der Waals) compared to the others, which are more saturated hydrocarbons.

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