CH3 CH 丁烷 丁烯 C=C CH3-CH2-CH2-CH2 CH3-CH2-CH=CH H CH3-CH-CH3 CH3CH=w)…c=C 3 CH3-C=CH2 CH H丁烷 丁烯 CH3 -CH2 -CH2 -CH2 CH3 -CH-CH3 CH3 CH3 -CH2 -CH=CH2 CH3 -CH =CH-CH3 CH3 CH3 -C=CH2 C C CH3 CH H 3 H C C CH3 H CH3 H