COMEDK Exam 2014 Solved Paper

Question : 112 of 180

Marks: +1, -0

Arrangement of following compounds based on their boiling points in the increasing order. n-butane, 1-butanol, ethoxyethane and 1-propanol will be

1-propanol >n-butane > ethoxyethane > 1-butanol
n-butane < ethoxyethane < 1-propanol < 1-butanol
n-butane <1-propanol < ethoxyethame < 1-butanol
1-propanol <-butane < ethoxyethane <-butanol

Validate

Solution:

Boiling point increases with increase in molecular mass so, 1-butanol has higher boiling point than 1-propanol.
Unlike alcohols, ethers do not form hydrogen bonds thus, they have lower boiling points than the corresponding alcohols.
Due to weak dipole-dipole interactions, the boiling points of lower ethers are only slightly higher than those of the n-alkanes having comparable molecular masses.Thus, the increasing order of boiling points is
n-butane

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