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Question

Arrange the following compounds in the increasing order of their boiling points.
CH3CH2CH2CHO,CH3CH2CH2CH2OH,H5C2−O−C2H5,C2H5CH2C2H5

A
CH3CH2CH2CH2CH3 <H5C2OC2H5<CH3CH2CH2CHO < CH3CH2CH2CH2OH
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B
CH3CH2CH2CH2CH3 >H5C2OC2H5 > CH3CH2CH2CHO < CH3CH2CH2CH2OH
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C
CH3CH2CH2CH2CH3 <H5C2OC2H5<CH3CH2CH2CHO > CH3CH2CH2CH2OH
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D
CH3CH2CH2CH2CH3 >H5C2OC2H5<CH3CH2CH2CHO >CH3CH2CH2CH2OH
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Solution

The correct option is A CH3CH2CH2CH2CH3 <H5C2OC2H5<CH3CH2CH2CHO < CH3CH2CH2CH2OH
For boiling points, the increasing order is Hydrocarbons < Ethers < Aldehyde < Alcohol of similar molecular mass. Therefore the given order would be:
CH3CH2CH2CH2CH3<C2H5OC2H5<CH3CH2CH2CH2CHO<CH3CH2CH2CH2OH

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