
In chemistry, an ethyl group is an alkyl substituent derived from ethane (C2H6). It has the formula –C2H5 and is very often abbreviated Et. Ethyl is used in the IUPAC nomenclature of organic chemistry for a saturated two-carbon moiety in a molecule, whilst the prefix `eth-` is used to indicate the presence of two carbon atoms in the molecule. .....
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http://en.wikipedia.org/wiki/Ethyl_group

the univalent group, CH–, derived from ethane. Also called
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https://www.infoplease.com/dictionary/ethyl-group
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