CH3 CHCH2 CH2CH-CHCH3 CHCHCH-CHCH2CH 6 5 4 3 21 1 23 456 2-Hexene 2-Methyl-3-hexene CH3CH2 H 2C=C1 CH3 CH.CH2CH2 H 543 H.G-C-CH-CH2 3 2-Ethyl-1-pentene 2-Methyl-1,3-butadiene @2004 Thomson-Brooks/Cole