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Question
Arrange the following in decreasing order of solubility in water:
\[\ce{(CH3)3N,(CH3)2NH,CH3NH2}\]
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Solution
Higher the value of hydration enthalpy, more is the solubility. Also, larger the hydrocarbon part attached to the nitrogen of amine, lower is the tendency to form hydrogen bonds and lower is the solubility.
Thus, the decreasing order of solubility in water is \[\ce{CH3NH2>(CH3)2NH>(CH3)3N}\].
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