543 c—HC=c—c=CH-—CH 2. 4-Hexadiene 2,4-己二烯 H3 H H CH3 H H3C C-C CH3 H (2E, 4E)-2, 4-Hexadiene (2Z, 42-2, 4-Hexadiene (trans, trans-2, 4-Hexadiene (cis, cis-2, 4-Hexadiene 1, 3-CyclohexadieneHC C H C H 2,4-Hexadiene 2,4-己 二 烯 CH 5 4 3 2 1 H3 C CH3 6 H H3 C H C C (2E,4E)-2,4-Hexadiene (trans, trans-2,4-Hexadiene ) H H CH3 H3 C H H C C (2Z,4Z)-2,4-Hexadiene (cis, cis-2,4-Hexadiene ) H CH3 H 1,3-Cyclohexadiene