Why are the boiling points of carboxylic acids higher than the corresponding alcohols ?

Explanation

We know that, carboxylic acids and alcoliols both have intermolecular hydrogen bonding in their molecules. But O-H bond in carboxylic acids is more polarised than in alcohols due to the presence of > C = 0 group. hence, the magnitude of hydrogen bonding in acids is more than that in alcohols, i.e. hydrogen bonds are stronger in acids.
Also, exists as dimer. It increases degree of hydrogen bonding and hence higher will be the boiling point of acids :

Aliphatic carboxylic acids having carbon atom up to four are soluble in water. But solubility of acids decreases with increases of carbon atom. This is due to increased, hydrophobic interactions of hydrocarbons.