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10.D【解析】M发生消去反应产生N是，反应①是消去反应，A项错误；M分子中不饱和C原子上有2个H原子，因此不存在顺反异构体，B项错误；根据选项A分析可知N是人√，分子中存在2个乙烯的平面结构，两个乙烯平面可能在同一平面上，还存在一个饱和C原子，具有甲烷的四面体结构，最多有3个原子共平面，则在同一平面上的原子数目最多是11个，C项错误；根据二烯烃1,4加成规律，可知入发生加聚反应，在催化剂存在条件下产生顺式聚异戊二烯的结构简式是CH3HECH2CH2,D项正确。
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