In
the following compounds, __ is the most acidic.
A: 1,4-dihydroxyanthraquinone
B: 1,8-dihydroxyanthraquinone
C: 2,7-dihydroxyanthraquinone
D: 1,2-dihydroxyanthraquinone
E: 1,6-dihydroxyanthraquinone
the following compounds, __ is the most acidic.
A: 1,4-dihydroxyanthraquinone
B: 1,8-dihydroxyanthraquinone
C: 2,7-dihydroxyanthraquinone
D: 1,2-dihydroxyanthraquinone
E: 1,6-dihydroxyanthraquinone
举一反三
- 已知M(1,4),N(-1,-3),向量MN的坐标 A: (2,7) B: (-2,7) C: (-2,-7) D: (2,-7)
- Which of the following compounds is the most acidic? A: phenol B: p-cresol C: p-nitrophenol D: benzyl alcohol
- 常见的数据选择器有2选1,4选1,8选1和16选1等等。
- 光圈整档逐级递增或递减形成1:1,2:1,4:1,8:1等不同的光比。
- 若直线与曲线C1:y=x3+3和C2:y=x3-1都相切,则该直线与C1,C2的切点分别为______ A: (-1,2)和(1,-2). B: (1,4)和(-1,-2). C: (-1,2)和(-1,-2). D: (-1,2)和(1,4).