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Which of the following has a lower boiling point than ethanamine?(a) Propane(b) Ethanal(c) Ethanol(d) Methanoic acidI have been asked this question in a national level competition.This key question is from Amines Physical Properties in chapter Amines of Chemistry – Class 12

Answer»

Right choice is (a) Propane

For explanation: All given compounds have similar molecular masses and can be compared. Ethanamine has a higher BOILING point than propane because it is a POLAR MOLECULE and forms intermolecular hydrogen bonds. However, it has a LOWER boiling point than ethanal, ETHANOL and methanoic acid as the O-H bonds in these compounds is more polar than the N-H bond in ethanamine. This makes the hydrogen bonds stronger.



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