Answer:
As the branching increases, surface
area decreases. As a result, magnitude of van der Waals forces of attraction
decreases and hence the boiling point decreases. Now 2- methyl pentane has the
largest surface area and hence has the highest boiling point. Further because
of the presence of two branches on the same carbon, 2, 2-dimethylbutane has
lower surface area and hence has lower boiling point than that of 2,
3-dimethylbutane. Thus, the overall order of decreasing boiling points is :
2-methylpentane (333 K) > 2, 3-dimethylbutane (331 K) > 2, 2-
dimethylbutane (323 K).
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