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  4. The correct order of boiling point of ethyl dimethyl amine , n-butyl amine and diethyl amine is

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Q. The correct order of boiling point of ethyl dimethyl amine , n-butyl amine and diethyl amine is

Rajasthan PETRajasthan PET 2009

Solution:

Among $ 1{}^\circ ,2{}^\circ $ and $ 3{}^\circ $ amines, the primary amine has the maximum strength to form the H-bond. The dipole-dipole attraction force also works between these molecules, hence the boiling point of primary amine is maximum. Between $ 2{}^\circ $ and $ 3{}^\circ $ amines, the tertiary amines does not form H-bond while secondary amine has some strength to form H-bond. Hence, the order of boiling point is as;
$ \underset{\begin{smallmatrix} n-butyl\text{ }amine \\ \,\,\,\,1{}^\circ amine \\ \,\,\,\,\,\,\,(B) \end{smallmatrix}}{\mathop{{{C}_{4}}{{H}_{9}}N{{H}_{2}}}}\,>\underset{\begin{smallmatrix} diethyl\text{ }amine \\ \,\,\,\,\,\,\,\,\,2{}^\circ amine \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(C) \end{smallmatrix}}{\mathop{{{({{C}_{2}}{{H}_{5}})}_{2}}NH}}\,>\underset{\begin{smallmatrix} ethyl\text{ }diethyl\text{ }amine \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,3{}^\circ amine \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(A) \end{smallmatrix}}{\mathop{{{C}_{2}}{{H}_{5}}N{{(C{{H}_{3}})}_{2}}}}\, $