Carboxylic acids are the compound containing carboxyl group in their molecules.
-C with a double bond with oxygen and single bond with OH
Esters are compounds which are formed when the hydroxy hydrogen atom in oxygen acids is replaced by an alkyl group. The acid may be organic or inorganic.
Esters of organic acid:
These are compounds formed by replacing the hydrogen atom of the carboxyl group by an alkyl group.
In -COOH of carboxylic acids H is replaced an alkyl group.
It may be represented as R-COO-R'.