question archive Rank the following compounds according to their boiling point

Rank the following compounds according to their boiling point

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Rank the following compounds according to their boiling point. 
Highest Boiling Point 
Lowest Boiling Point 
n-butanal 1-butanol butane 
butanoic acid 
 

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You are looking for intermolecular interactions here.
Butanoic acid has the strongest due to the carboxylic acid group, it can even form a dimer. It will have the highest BP.

Butanol is next. It has hydrogen bonding interactions due to the alcohol.

Then Butanal which has a dipole due to its carboxyl group

Then Butane. It only has van der waals holding it together

4>2>1>3