(1) Acetaldehyde on reaction with 2,4- Dinitrophenylhydrazine forms 2,4- Dinitrophenylhydrazone.
(2) Acetone on reaction with 2,4- Dinitrophenylhydrazine forms 2,4- Dinitrophenylhydrazone.
(3) Butanone on reaction with 2,4- Dinitrophenylhydrazine forms 2,4- Dinitrophenylhydrazone.