问题 选择题

某饱和一元醇14.8g和足量的金属Na反应,生成标准状况下氢气为2.24L,该醇可氧化成醛,则其结构可能有几种(  )

A.2种

B.3种

C.4种

D.5种

答案

标准状况下氢气为2.24L即0.1mol,质量为0.2g,

    2CnH2n+1OH~H2

   (12n+2n+2+16)×2         2

    14.8g                    0.2g

(12n+2n+2+16)×2 
14.8g                    
=
   2
  0.2g
,所以n=4,

能样化生成醛的醇有:CH3CH2CH2CH2OH;CH3CH(CH2OH)CH3

故选A.

阅读理解

Once there was an island where all the feelings lived: Happiness, Sadness, Knowledge, and all of the others, including Love. One day it was said that the island would go down, so all made boats and left except Love.

Love was the only one who stayed. Love wanted to offer her help until the last possible moment. When the island had almost gone down, Love decided to ask for help.

Richness was passing by Love in a great boat. Love said, “Richness, can you take me with you?” Richness answered, “No, I can’t. There is a lot of gold and silver in my boat. There is no place here for you.”

Sadness was close by, so Love asked, “Sadness, let me go with you .” “Oh, Love, I am so sad that I need to be by myself!”

Happiness passed by Love, too, but she was so happy that she did not even notice when Love called her.

Suddenly, there was a voice, “Come, Love, I will take you.” It was an elder. Love was so excited that she even forgot to ask who the elder was. So Love asked Knowledge, another elder, “Who helped me?” “It was Time,” Knowledge answered. “Time?” asked Love. “But why did Time help me?”

Knowledge smiled with deep wisdom and answered, “Because only Time understands how valuable Love is.”

小题1:What would happen to the island?

A.It would grow bigger.

B.It would sink.

C.It drove feelings away.

D.All the feelings lived.小题2:Sadness didn’t see Love when he passed by Love, did he?

A.Yes, he did.

B.Yes, he didn’t.

C.No, he didn’t.

D.No, he did.小题3:Why didn’t Happiness help Love?

A.Because Happiness didn’t like Love.

B.Because Happiness didn’t hear Love calling her.

C.Because her boat was so small that she couldn’t take Love with her.

D.Because she needed to be by herself.小题4:Who helped Love out of danger?

A.Sadness.

B.Knowledge.

C.Happiness.

D.Time.小题5:What does the underlined word “valuable” mean in Chinese?

A.令人喜爱的

B.珍贵的

C.吸引人的

D.有爱心的

填空题