Question

Why Carboxylic acids exist as dimer??

Answer 1

Carboxylic acids exist as dimer with two molecules held together by hydrogen bonding,As we see the carboxylic acid in vinegar can hydrogen bond to each other, and their bonding is to greater extent.

Answer 2

Carboxylic acids exist as dimer because the carboxylic acid has oxygen atom and hydrogen atom. The oxygen ion has a lone pair of electron.  

Explanation:

• On the other hydrogen has a free accepting orbits for electrons. Hence the lone pair of first oxygen gets donated to the valence orbital of second hydrogen.  

• Also the lone pair of second oxygen is donated to hydrogen of first molecule. Thus a resultant dimer is formed. So carboxylic acids always exist in the form of a dimer.

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