Which compound has the highest boiling point?

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1 Answer
Apr 26, 2018

The correct answer is A.

Explanation:

A. Propionamide

The #"NH"_2# group can form two hydrogen bonds, and the #O"# atom has two lone pairs available to form two more hydrogen bonds.

Thus, one molecule of propionamide can form a hydrogen bond to four other molecules,

B. #N#-methylacetamide

The #"NH"# group can form one hydrogen bond, and the #"O"# atom has two lone pairs available to form two more hydrogen bonds.

Thus, one molecule of #N#-methylacetamide can form hydrogen bonds to three other molecules,

C. #N,N#-Dimethylacetamide and D. ethyl acetate

Neither compound has hydrogen bonding. The strongest intermolecular forces are dipole-dipole interactions.

Propionamide has the strongest intermolecular forces,

It should have the highest boiling point.