As nouns the difference between ethanal and propanal
is that ethanal is ethanal while propanal is (organic compound) propionaldehyde.
ethanal
English
Noun
(-)
(organic compound) acetaldehyde
Usage notes
* This is the IUPAC name, rarely used in research or industry.
propanal
English
Noun
(organic compound) propionaldehyde