Which of the following has a different functional group than CH3−CH2−CHO?
CH3COOH
CH3−CH2−CHO → in this primary functional group is -CHO(aldehyde).
Option (a) has -CHO group (aldehyde)
Option (b) has R-CO-O-R1 group (ester)
Option (c) has -COOH group (carboxylic acid)
Option (d) has -CO- group(ketone)