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Arrange the following in increasing order of their boiling points
$\begin{array}{ccc}\text { N-Ethylethanamine } & \text { Butanamine } & \begin{array}{c}\text { N, N-dimethyl } \\ \text { ethanamine }\end{array} \\ \text { I } & \text { II } & \text { III }\end{array}$
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$\begin{array}{ccc}\text { N-Ethylethanamine } & \text { Butanamine } & \begin{array}{c}\text { N, N-dimethyl } \\ \text { ethanamine }\end{array} \\ \text { I } & \text { II } & \text { III }\end{array}$
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The correct answer is:
II $>$ I $>$ III
The boiling point of amines increases with increasing molecular mass and with decreasing number of alkyl groups to the amino $\mathrm{N}$-atom because of $\mathrm{H}$-bonding.
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