下列几种烃类物质:(1)环辛四烯的分子式为__。(2)互为同分异构体的有__和__、__和__(填写名称,可以不填满,也可以再补充)。(3)正四面体烷的二氯取代产物有__种;立方烷的二氯取代产物有__种。(4)关于乙烯基乙炔分子的说法错误的是__(填字母符号)。
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