In organic chemistry terms the difference between dimethyl and diethyl
is that dimethyl is (in combination) Two methyl groups in a molecule while diethyl is two ethyl groups attached to the same molecule.
dimethyl
English
Noun
(-)
(organic chemistry) (in combination ) Two methyl groups in a molecule.
diethyl
English
Noun
(organic chemistry) Two ethyl groups attached to the same molecule.