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【单选题】
下列各化合物亲电取代反应的活性由强到弱的次序为( ) I 、苯酚 II、对硝基苯酚 III、2,4-二硝基苯酚 IV 、3,4,6-三硝基苯酚
A.
I>III>II>IV
B.
I>II>III>IV
C.
II>III>I>IV
D.
I>II>IV>III
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