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【单选题】
下列对有机物结构或性质的描述，错误的是
A.
一定条件下，Cl2可在甲苯的苯环或侧链上发生取代反应
B.
苯酚钠溶液中通入CO2生成苯酚，则碳酸的酸性比苯酚弱
C.
乙烷和丙烯的物质的量各1mol，完成燃烧生成3molH2O
D.
光照下2，2—二甲基丙烷与Br2反应，其一溴取代物只有一种
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