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【多选题】
持有现金的动机有哪些( )。
A.
交易性动机
B.
预防性动机
C.
投机性动机
D.
筹资性动机
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【单选题】下列化合物中,能够与希夫试剂反应显红色,而且加入浓硫酸红色不消失的是
A.
甲醛
B.
乙醛
C.
苯甲醛
D.
丙酮
【单选题】下列与希夫试剂显色的是()。
A.
乙醛
B.
丙酮
C.
乙酸
D.
乙胺
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【单选题】关于希夫试剂的显色反应,下列说法 错误 的是
A.
品红亚硫酸试剂称为希夫试剂
B.
醛能够与希夫试剂显色
C.
酮能够与希夫试剂显色
D.
甲醛与希夫试剂反应后生成紫红色物质
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A.
托伦试剂
B.
斐林试剂
C.
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D.
希夫试剂
【单选题】下列与希夫试剂显色的是( )。
A.
己醛
B.
丙酮
C.
乙酸
D.
乙胺
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