在稀碱作用下,下列哪组不能进行羟醛缩合反应? ()
A. HCHO + (CH3)3CCHO
B. CH3CH2CHO + C6H5CHO
C. HCHO + CH3CHO
D. C6H5CH2CHO + (CH3)3CCHO
磁共振下的研究说明,只有在睡眠状态下,大脑神经元才会有节律地同时“开”或“关”。
A. 对
B. 错
This year, as usual, many people are leaving their homes to browse around the shops.
A. 对
B. 错
下面化合物羰基活性最强的是: ()
A. ClCH2CH2CHO
B. CH3CH2CHO
CH3CHClCHO
D. C6H5CHO