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What is an alkyl group?
- How many carbons are in methyl, ethyl, propyl and butyl? Is methyl the same as methane...?
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An alkyl group is a piece of a molecule with the general formula CnH2n+1, where n is some
integer. For example, a methyl group (CH3) is a fragment of a methane molecule (CH4); n = 1 in this case.
The -yl ending means "a fragment of an alkane formed by removing a hydrogen".
Alkane | Formula | Alkyl group | Formula |
methane |
CH4 |
methyl group |
-CH3 |
ethane |
CH3CH3 |
ethyl group |
-CH2CH3 |
propane |
CH3CH2CH3 |
n-propyl group |
-CH2CH2CH3 |
butane |
CH3CH2CH2CH3 |
n-butyl group |
-CH2CH2CH2CH3 |
Author: Fred Senese senese@antoine.frostburg.edu |