醋酮酸是一种医药中间体,其结构如下: 请回答:(1)醋酮酸中含氧官能团的名称是______. (2)1mol醋酮酸与足量Na发生反应最多生成______mol H 2 . (3)写出醋酮酸在一定条件下发生缩聚反应的化学方程式:______. (4)下列关于醋酮酸的说法正确的是______(填序号). ①分子式为 C 4 H 8 O 3 ②能发生消去反应,其产物只有一种 ③与醋酮酸具有相同官能团的同分异构体共有5种(不含醋酮酸)
【简答题】You
should spend about 20 minutes on this task. The charts A and
B show the share of the UK and Australian cinema market in 2001 and cinema
admission in the UK and Australia from 1976 to 2006. Write a...
【简答题】Real exports of developing economies more than doubled between 1998 and 2006,whereas those of the G-7 rose by less than 50 percent. Among the developing regions, East and South Asia were clearly the m...
【简答题】听力原文:In 1986, there were over 40 million computers in the world, while by 2006, that number climbed to about 800 million—a twenty-fold increase in two decades. (52)