CH1012
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GROUP NOMENCLATURE
The following are common group names:

methyl      CH3-                                 = Me
ethyl         CH3CH2-              = C2H5  = Et
propyl      CH3CH2CH2-        = C3H7  = Pr
butyl         CH3(CH2)3-          = C4H9  = Bu
phenyl      C6H5-                                = Ph
benzyl       (C6H5)CH2-
methoxy    CH3O-                             = OMe
vinyl           CH2=CH-
methylene -CH2-
methine      -CH-