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【多选题】
卤代烃与氢氧化钠的水溶液反应，下列属于SN2机理的是A.
产物构型完全发生翻转
B.
叔卤代烷的反应速率大于卤代烷的反应速率
C.
碱的浓度增加，反应速率增大
D.
反应速率只与卤代烃有关
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