Ethyl (C2H5-) is a group in organic chemistry.

Thhis the radical ethyl.

In this molecule you have 2 different carbon chains separated by the functional ether group. The generic formula for an ether is R-O-R. Your first group is a 2 carbon chain called an ethyl and your second group is a 1 carbon called a methyl. So you have a methyl group and ethyl group which must be put together in in alphabetical order ethyl-methyl and then followed by the functional group -ether. Thus your final molecule name is ethyl-methyl-ether. Good luck with the rest of O. Chem!

carboxyl

C2H5 is the ethyl group.