题干

根据下列要求,从①H2O   ②CH2=CH2③CH3COOH   ④HNO3⑤CH3CH2OH中选择恰当的反应物,并写出对应的化学方程式,指出反应类型.


化学方程式

反应类型

(1)得到乙醇的反应

  

  

(2)与苯发生取代反应

  

  

(3)炒菜时加入一些料酒和食醋,可使饭菜变得味香、可口的原因

  

酯化反应

(4)由乙烯合成高分子化合物

  

  

上一题 下一题 0.0难度 选择题 更新时间:2019-11-25 05:06:49

答案(点此获取答案解析)


催化剂

化学方程式

反应类型

(1)


CH2=

同类题2

根据短文理解,选择正确答案。

    My husband hasn't stopped laughing about a funny thing that happened to me. It's funny now but it wasn't at the time.

    Last Friday, after doing all the family shopping in town, I wanted a rest before catching the train, so I bought a newspaper and some chocolate and went into the station coffee shop — that was a cheap self-service place with long tables to sit at. I put my heavy bag down on the floor, put the newspaper and chocolate on the table to keep a place, and went to get a cup of coffee.

    When I went back with the coffee, there was someone in the next seat. It was one of those wild-looking youngsters, with dark glasses and worn clothes, and hair colored bright red at the front. Not so unusual these days. What did surprise me was that he'd started to eat my chocolate!

    Naturally, I was annoyed. However, to avoid trouble — and really I was rather uneasy about him — I just looked down at the front page of the newspaper, tasted my coffee and took a bit of chocolate. The boy looked at me closely. Then he took a second piece of my chocolate. I could hardly believe it. Still I didn't dare to start an argument. When he took a third piece, I felt more angry than uneasy. I thought, "Well, I shall have the last piece." And I got it.

    The boy gave me a strange look, and then stood up. As he left he shouted out. "This woman's crazy!" Everyone stared. That was embarrassing enough, but it was worse when I finished my coffee and got ready to leave. My face went red — as red as his hair — when I realized I'd made a mistake. It wasn't my chocolate that he'd been taking. There was mine, unopened, just under my newspaper.