高三综合训练试题第三部分有机化学一、选择题１．随着碳原子数的增多，碳元素的质量百分含量也增大的是（）。Ａ．烷烃同系物Ｂ．烯烃同系物Ｃ．炔烃同系物Ｄ．苯的同系物２．甲烷分子中的四个氢原子都可以被取代。若甲烷分子中的四个氢原子都被苯基取代，则可得到的分子... The third grade comprehensive training test questions The third part of the organic chemistry First, multiple choice questions 1. As the number of carbon atoms increases, the mass percentage of carbon increases (). A. Alkane homolog B. Olefin homologues C. Alkyne homologues D. Congeners of benzene 2. All four hydrogen atoms in the methane molecule can be substituted. If all four hydrogen atoms in the methane molecule are replaced by phenyl groups, the available molecules...