In organic compound terms the difference between ethanal and methanal
is that ethanal is acetaldehyde while methanal is the IUPAC name for formaldehyde, rarely used in research or industry.
ethanal
English
Noun
(-)
(organic compound) acetaldehyde
Usage notes
* This is the IUPAC name, rarely used in research or industry.
methanal
English
Noun
(
en noun)
(organic compound) The IUPAC name for formaldehyde, rarely used in research or industry.