A) \[III<II<I\]
B) \[I<II<III\]
C) \[II<III<I\]
D) \[II<I<III\]
E) \[III<I<II\]
Correct Answer: A
Solution :
The boiling points of amines depends upon their degree of association and the degree of association is further depends upon the extent of H-bonding. Since\[1{}^\circ \]amines have two,\[2{}^\circ \]amines have one while 3° amines have no hydrogen atoms linked to nitrogen, therefore among isomeric amines, \[1{}^\circ \]amines have the highest, while\[3{}^\circ \]amines have the lowest boiling point. Thus, the increasing order of boiling point is \[\underset{N,\text{ }N-dimethylethylamine\text{ }(III)}{\mathop{C{{H}_{3}}\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{N}}\,C{{H}_{2}}C{{H}_{2}}}}\,\] \[\underset{diethylamine\text{ }(II)}{\mathop{<C{{H}_{3}}C{{H}_{2}}NHC{{H}_{2}}-C{{H}_{3}}}}\,\] \[\underset{n-butylamine\text{ }(I)}{\mathop{<C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}N{{H}_{2}}}}\,\]
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