推荐回答（5个）
1、苯环上的氢原子被卤素原子取代发生的反应叫亲电取代反应，例如：
2、亲电取代反应机理：
3、用氧化反应是不能达到目的的
当然是取代反应，卤素原子取代苯环上的氢原子，不会发生氧化反应，氧化还原反应是伴随着化合价的升降，而在有机中，只有消去、加成才会有化合价的变化（还有燃烧）。
苯环(phenyl ring)是一个闭合的共轭体系，六个碳原子的π电子云分布是一样的。但当苯环上有一个取代基时，取代基会改变苯环的电子分布，使分子极化。诱导效应和共轭效应都能产生这种分子极化。不仅使苯环的电子云密度增加或降低，而且还决定了苯环上各个位次电子云密度分布情况。
1.可以发生亲核取代反应（卤素变） 如卤苯在强碱条件下如NaNH2下回反应得到氨基苯
2.邻对位基团有强吸电子基团如-NO2
依旧符合定位效应的亲电取代反应，上邻对位
p.s.邻对位定位效应活性与间位定位效应
一.邻对位效应
1.强活化：伯氨基-NR2，仲氨基-NHR，氨基-NH2，羟基-OH 2.中等活化:酰胺基-NHCOR(碳氧双键)，醚-OR， 羰基-OCOR（第二个是碳氧双键） 3.弱活化：烷基-R，苯基Ar， 4.弱钝化:卤代烷基-CH2X，卤原子-X
二.间位效应，钝化程度依次减弱：-N+R3，-NO2，-CF3，-CCI3，-CN,--SO3H,-CHO,-COR,-CO2H,-CO2R,-CONR2,
发生的是取代反应，本质上卤素原子的化学价降低，发生了还原反应，那相应的有机物发生的就是氧化反应。但在高中化学中卤代反应一般答取代反应，否则不得分。
苯环上的主要反应是亲电取代反应，这类反应是有一定的应用价值的，其次就是氧化反应，譬如工业上就是用苯的氧化来制备顺丁烯二酸酐，而对于加成反应没有一定的实际应用价值。所以当苯环上有卤素原子时，仍可发生取代反应，还可以在环上引入其它基团，如硝基、卤素、磺酸基等。
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