由蒸汽密度(分子量)和烷烃通式CnH2n+2可知n=9
有6个甲基,可以推断A结构式为
CH3 CH3
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CH3—C—CH2—C—CH3
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CH3 CH3
则共轭二烯烃为
CH3 CH3
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CH3==C—CH2==C—CH3
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CH3 CH3
图错位,凑合看
C
C=C-C-C-C
C C C
其中第二行3号C与下一行C以双键相连,其余以单件相连
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