问题 判断题

(8分)已知:

①CH3COONa+NaOH CH4↑+Na2CO3

②R—CH==CH2+H2ORCH2CH2OH

现有分子式为C8H9Br的有机物在一定条件下能发生下图所示的一系列反应:

请完成下列问题:

(1)写出C8H9Br的结构简式:__________。

(2)上述反应中属于取代反应的有(填编号) __________,反应③④⑦⑩各属何种类型反应__________________________________________________。

(3)写出③⑥⑨三个反应的化学方程式:

③____________________________________________________________;

⑥____________________________________________________________;

⑨____________________________________________________________。

(4)写出B可能有的3种同分异构体(要求:①苯环上只有一个取代基,②3种异构体不同类别):

______________________________________________________________________________。

答案

(1)

(2)①⑥⑨  ③:氧化反应  ④:中和反应  ⑦:消去反应  ⑩:加聚反应

(3)+2Ag(NH3)2OHCH2COONH4+3NH3↑+H2O+2Ag

 

,推知C8H9Br为

,则上支变化可表示为:

,中间一支表示为:

选择题
阅读理解

       It takes courage to stand up at work.Now more and more people are standing up when they are working on something important.Standing up is in fashion.Medical researchers have found that people who stand at work tend to be much healthier than those who sit.But I wasn't just looking for better health — standing would also improve how I work and relax my body.

In recent years, many office supply companies have begun to sell adjustable desks.These so-called "sit / stand" models are equipped with an electric motor that lets them shift from chair height to person height at the push of a button.Unfortunately, sit / stand desks tend to be expensive, hard to find and not very easy to test in person.

I discovered that when I worked standing up, my mind was clearer and new ideas kept coming to me.I suspect that this is because when you're standing, you feel a bit unchained from your desk.If I got stuck on a word or sentence as I wrote it, I found myself shaking my arms, bouncing (跳) on my feet or stepping away from the desk for a bit — things I couldn't do in a chair.Often, standing up seemed to relax my mind enough for me to get over creative barriers.

There's another thing about standing for a long time: I tend to get hungrier than I do when I sit on a chair.That feels like confirmation(证实) of the stand-up advocates’ belief that you burn more calories when you stand than when you sit.For this reason alone, I' m hoping that one day mass-market furniture companies can make many low-priced versions of sit / stand desks.We could all work with a bit more standing up.

小题1:The author likes standing up while working because __________.

A.he wants to show that he has a lot of courage

B.researchers say standing makes one healthier

C.he intends to catch up the fashion trend

D.he hopes to improve his work and relax himself小题2:It can be inferred from the text that   ________.

A.adjustable desks are mass-produced now

B.adjustable desks are easy to operate

C.cheaper adjustable desks will soon be available

D.adjustable desks can be tried out easily小题3:What is the main idea of the text?

A.Standing up at work is a better choice.

B.Standing up at work takes courage.

C.Standing up at work burns more calories.

D.Standing up at work will replace traditional sitting.