Since esters are cleaved on hydrolysis, the molecular weight of the acid derived from an ester is always lower than the molecules weight of the ester. however, esters are equally liquids while carboxylic acids are usually solids. suggest reasons for this observation and explain.

Esters  contains  a  double  bond  between  carbon  atom  and  oxygen  atom  while  carboxylic  acid  lack  double  bond  between  carbon  and oxygen atom.The  lack  of  double  bond in  carboxylic  acid  make  the  force  of  interaction between  carbon  and  oxygen  strong  and  particles  become tightly  packed  which  make  carboxylic  acid  solid.  The  presence  of  double  bond  in  esters make  the  force  of  interaction  weak  thus  they  are  liquid.