【单选题】【消耗次数：1】
下列物质不能与新制Cu(OH)2反应的是（ ）。
①
乙烷
②
苯甲醛
③
乙酸
④
乙醛
参考答案：
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【多选题】
下列各方法中能用来鉴别乙醇、乙醛和乙酸的有( )
①
先加托伦试剂，再加碳酸氢钠溶液
②
先加碘的氢氧化钠溶液，再加斐林试剂
③
先加希夫试剂，再加碳酸氢钠溶液
④
先加碳酸氢钠溶液，再加金属钠
⑤
先加金属钠，再加托伦试剂
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