环丁烯(这个图还不好画.4个C形成环,一个双键)
CH2=CH-CH=CH2 1.3-丁二烯
CH2=C=CHCH3 (不稳定) 1,2-丁二烯
C三键C-CH3 C三键C-CH2-CH3 CH3-C三键C-CH3
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CH3