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Question

Arrange the following compounds in increasing order of their boiling points.
(i) CH3CH2CHO
(ii)CH3CH2CH2OH
(iii) CH3CH2CH3

A
(i) > (ii) > (iii)
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B
(ii) > (i) > (iii)
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C
(i) > (iii) > (ii)
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D
(iii) > (i) > (ii)
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Solution

The correct option is B (ii) > (i) > (iii)
The polar and stronger carbon-to-oxygen double bond result in increase dipole-dipole interaction which causes aldehydes and ketones to have higher boiling points than those of alkanes of similar molecular masses but lower than those of comparable alcohols that engage in intermolecular hydrogen bonding.
Hence, this is the increasing order corresponding functional groups boiling points
CH3CH2CH2CH2OH>CH3CH2CH2CHO>CH3CH2CH2CH3.

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