Trimethylamine, ethylmethylamine, and propylamine are constitutional isomers. Based on their shapes and hydrogen bonding ability, which of the following is true regarding their boiling points? A) They all have very nearly the same boiling points, so it is hard to predict the order. B) The predictions based on shape are opposite to those based on hydrogen bonding considerations, so it is hard to predict the order. C) propylamine trimethylamine

Question

Trimethylamine, ethylmethylamine, and propylamine are constitutional isomers. Based on their shapes and hydrogen bonding ability, which of the following is true regarding their boiling points? A) They all have very nearly the same boiling points, so it is hard to predict the order. B) The predictions based on shape are opposite to those based on hydrogen bonding considerations, so it is hard to predict the order. C) propylamine < ethylmethylamine < trimethylamine D) propylamine > ethylmethylamine > trimethylamine

Quizplus · Accepted Answer

Propylamine can form hydrogen bonds due to the presence of an NH group, leading to a higher boiling point. Ethylmethylamine can also form hydrogen bonds but less effectively than propylamine. Trimethylamine, being tertiary, cannot form hydrogen bonds, resulting in the lowest boiling point among the three.

Trimethylamine, Ethylmethylamine, and Propylamine Are Constitutional Isomers