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Question

Arrange in the compounds in their decreasing order of boiling point.

A
Methoxyethane
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B
Acetone
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C
n-Butanol
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D
Butane
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Solution

Order: n-Butanol > Acetone > Methoxyethane > Butane
Greater the polarity, higher the boiling point. n-Butanol has the highest boiling point among the given compounds due to H-bonding. Due to strong dipole-dipole interactions, carbonyl compounds have a higher boiling point than ethers of similar molecular mass which have weak dipole interactions.
Hydrocarbons have the lowest boiling points because they have weak dispersion forces only.

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