题目内容
与亲电试剂 Br2、Cl2、HCl 的加成反应，烯烃比炔烃活泼。然而当炔烃用这些试剂处理时，反应却很容易停止在烯烃阶段，生成卤代烯烃，需要更强烈的条件才能进行第二步加成。这是否相互矛盾，为什么？
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