更多"羟基蒽醌的UV吸收峰位和强度受β- OH影响的峰是"的相关试题:
[单项选择]羟基蒽醌的UV吸收峰位和强度受β- OH影响的峰是
A. 230nm
B. 240～260nm
C. 262～295nm
D. 305～389nm
E. ＞400nm
[单项选择]
羟基葸醌的UV吸收峰位和强度受α-OH影响的峰是
A. 230nm
B. 240～260nm
C. 262～295nm
D. 305～389nm
E. ＞400nm
[单项选择]
羟基蒽醌的UV吸收峰波长受羟基数目影响，而且峰强度受。α-OH数目影响的峰是
A. 230nm
B. 240～260nm
C. 262～295nm
D. 305～389nm
E. ＞400nm
[单项选择]
羟基蒽醌的UV吸收峰波长受a-OH数目影响的峰是
A. 230nm
B. 240～260nm
C. 262～295nm
D. 305～389nm
E. ＞400nm
[单项选择]
羟基蒽醌的UV吸收峰波长受α-OH数目影响的峰是
A. 230nm
B. 240～260nm
C. 262～295nm
D. 305～389nm
E. ＞400nm
[单项选择]利用黄酮化合物的UV光谱判断黄酮结构中是C3-OH、C4=O还是邻二酚羟基引起的带Ⅰ位移，应选用的诊断试剂是
A. MeOH
B. MeONa
C. NaOAc
D. AlCl3
E. AlCl3/HCl
[单项选择]1-OH
A. 离子交换色谱
B. 聚酰胺色谱
C. 葡聚糖凝胶G
D. 大孔吸附树脂
E. 硅胶或氧化铝吸附色谱选择合适的色谱条件分离下列各组化合物
[单项选择]
W: Oh...oh dear, oh!
M: I’m so sorry... I think that was my fault...er...hang on, I’ll just pick all your...
W: Oh, no, thank you. You’re so kind...
M: I’ll pick up all your things for you. Here you are. Here’s your bag. Hey, just a minute. I can’t believe it...
W: Oh, no, no, no...
M: You just put your hand into my pocket and took my wallet out!
W: Oh, no, no. Excuse me. It was almost falling out.
M: But...what do you think you’re doing Give it back to me!
W: But here...here it is.
M: Thank you!
W: It was going to fall on the ground...
M: Right. Now, we’ll just go along to the guard of the train...
W: Oh dear, look at my things on the ground! It’s terrible!
M: We’ll just go along to the guard of the train and see what he has to say.
W: But I wasn’t doing anything!
Where does the conversation take pl
A. In the street.
B. At a hotel.
C. On a train.
[单项选择]无a-OH
A. 离子交换色谱
B. 聚酰胺色谱
C. 葡聚糖凝胶G
D. 大孔吸附树脂
E. 硅胶或氧化铝吸附色谱选择合适的色谱条件分离下列各组化合物
[单项选择]羟基ν-OH
A. 3300～2300cm-1
B. 1760～1695cm-1
C. 1610～1580cm-1
D. 1310～1190cm-1
E. 750cm-1
[单项选择]在一定温度下，能使Mg(OH)2、Fe(OH)2、Mn(OH)2等难溶物同时溶解的溶剂是( )。
A. 1mol·L-1NH3·H20
B. 纯H2O
C. 1mol·L-1NH4Cl
D. 1mol·L-1NaOH
[单项选择]用于区别3-OH黄酮和5-OH黄酮的显色反应是
A. HCl-Mg反应
B. Mg(AC)2反应
C. 柠檬酸二氯氧锆反应
D. NH3·SrCl2反应
E. NaBH4反应
