【单选题】分子式为C8H8O3的化合物具有下列1H NMR和13C NMR光谱。 推测该化合物的结构( )【图片】【图片】
【简答题】有机物A是分子式为C 7 H 8 O 2 的五元环状化合物,它具有四种不同化学环境的氢,其原子个数比为3:1:2:2它能发生如下转化: 根据以上信息,试回答下列问题: (1)写出化合物A中官能团的名称 。 (2)写出化合物B、F的结构简式B F 。 (3)A→B的反应类型是 ,F→G的反应类型是 。 (4)①写出D与CH 4 O反应的化学方程式 。②写出F→G的反应的化学方程式 。 (5)写出化合...
【单选题】Everyone in our class is _________ to know he passed the exam. [ ]
【单选题】Passage One Culture shock is the term given to the feelings of surprise, confusion, and disorientation that many foreigners feel when they live or study abroad. Scientists have noted that everyone exp...
A.
They are pleased by all the new things.
B.
They are disappointed at what they see.
C.
They miss their family and friends at home.
D.
They cannot help feeling irritated or frustrated.
【单选题】She often gets ______ late.