Aldehydes have boiling points lower than those of and higher than those of _ of comparable molecular masses.

alcohol, carboxylic acids

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alcohol, alkane

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alkane, alcohol

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carboxylic acids, alcohols

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Solution

The correct option is B alcohol, alkane
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.

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