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Arrange the following compounds in increasing order of their boilnig points: CH_(3)CH_(2)CH_(2)CH_(2)OH,CH_(3)CH_(2)COCH_(3),CH_(3)CH_(2)OCH_(2)CH_(3). |
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Answer» Solution :The four compounds have comparable molecular masses: `CH_(3)CH_(2)CH_(2)CHO(72),CH_(3)CH_(2)CH_(2)CH_(2)OH(74),CH_(3)CH_(2)COCH_(3)(72) and CH_(3)CH_(2)OCH_(2)CH_(3)(74)`. Amongst compounds having comparable molecular masses, alcohols have the highest b.p. due to INTERMOLECULAR H-bonding, i.e., `CH_(3)CH_(2)CH_(2)CH_(2)OH` has the highest boiling POINT. the boiling points of `CH_(3)CH_(2)CH_(2)CHO,CH_(3)CH_(2)OCH_(2)CH_(3) and CH_(3)CH_(2)COCH_(3)` DEPEND upon their RELATIVE dipole moments. since dipole moments of these three compounds decrease in the order: ketonesgtaldehydesgtethers., therefore, their boiling points also decrease in the same order, i.e., b.ps. decrease in order: `CH_(3)COCH_(2)CH_(3) GT CH_(3)CH_(2)CH_(2)CHO gt CH_(3)CH_(2)OCH_(2)CH_(3)`. thus, the boiling points of the four compounds decrease in the order: `CH_(3)CH_(2)CH_(2)OH gt CH_(3) COCH_(2)CH_(3) gt CH_(3) CH_(2)CH_(2) CHO gt CH_(3)CH_(2)OCH_(2)CH_(3)` |
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