Arrange the following compounds in increasing order of their boiling points. CH₃ CHO, CH₃ CH₂OH, CH₃OCH₃ , CH₃ CH₂ CH₃

<p>The molecular masses of the given compounds are in the range of 44-66 g/mol. The second molecule, CH₃CH₂OH contains OH alcoholic group due to which it undergoes extensive H bonding with each other molecules, leading to the association of the molecules. Therefore, it has the highest boiling point. In the molecule CH₃CHO, there is strong intermolecular dipole-dipole attraction due to presence of - CHO aldehydic group ( as H will have partial positive charge and oxygen will have partial negative charge, so there will attraction between molecules), which is weak in case of CH₃OCH₃ as both CH₃ groups have +I effect which results in decrease in electron affinity for the oxygen attached to it ( with no partially positive H atom). And in CH₃CH₂CH_3, there are only weak van there Waals forces of attraction. So the compounds in increasing order of their boiling point are:</p><p>CH₃CH₂CH₃&lt; CH₃OCH₃&lt; CH₃CHO&lt; CH₃CH₂OH.</p>

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