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Which of the following has a lower boiling point than ethanamine?

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in Chemistry – Class 12 by (188k points)
Which of the following has a lower boiling point than ethanamine?

(a) Propane

(b) Ethanal

(c) Ethanol

(d) Methanoic acid

I 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

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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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