Question

What is Et and Me in chemistry?

Answer 1

Et stands for ethyl ( C2H5) and Me stands for methyl  (CH3).

Answer 2

"Et" is an ethyl group, with two carbon atoms and five hydrogen atoms. It is $-CH_2-CH_3$
"Me" is a methyl group, with one carbon atoms and three hydrogen atoms. It is $-CH_3$
For example, $Me- CH_2-CH_2-Et$ is $CH_3-CH_2-CH_2-CH_2-CH_3$

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