问题 填空题

A、B两种有机物互为同分异构体,与足量氢气加成后均可生成2-甲基丁烷.与溴水充分反应后,A的生成物中每个主链碳原子上均有一个溴原子,B的生成物分子中,只有两个碳原子上有溴原子,则A的结构简式为______,B的结构简式为______.

答案

(1)根据能使溴水褪色及能跟H2加成生成2甲基丁烷,说明A和B均为分子中含5个C原子的不饱和烃,其碳骨架为

(2)1 mol A或B都可以跟320 g溴(2 mol Br2)完全反应,可知A和B分子中可能含一个三键或两个双键,

(3)B与Br2反应产物中Br分布在2个C原子上,则B分子中只有两个不饱和碳原子,B是炔烃,故B为

(4)A与Br2反应产物中Br原子分布在四个碳原子上,说明B中主链上四个碳均为不饱和碳,存在两个C═C,故A的结构简式为

故答案为:

单项选择题 A1/A2型题
阅读理解

A farmer had a cow.

A farmer had a cow. He took very good care of this cow and one day when it was ill, he was very worried. He telephoned the vet.

“What’s the problem?” The vet asked him when he arrived.

“My cow’s ill,” the farmer said. “I don’t know what's the matter with her. She’s lying down and won’t eat. She’s making a strange noise.”

The vet looked over the cow. "She’s certainly ill," he said, "and she needs to take some very strong medicine."

He took a bottle out of his box, put two pills into his hand and said, "Give her these. The pills should make her better."

“How should I give them to her?” the farmer asked.

The vet gave him a tube (管子)and said, "Put this tube in her mouth, then put the pills in the tube and blow(吹). That’ll make it."

The next day the vet came to the farm again. The farmer was sitting outside his house and looked more worried.

“How’s your cow?” the vet asked.

“No change,” the farmer said, “and I’m feeling very strange myself.”

“Oh?” the vet said, "Why?"

“I did what you said,” the farmer answered. “I put the tube in the cow’s mouth and then put two pills down it.”

“And?” the vet asked.

“The cow blew first,” the farmer said.

小题1:The farmer asked the vet for help when his cow _______

A.couldn't lie down

B.didn't eat the pills

C.couldn't make any noise

D.was ill小题2:What medicine did the vet give the farmer?

A.A bottle of pills.

B.A long tube.

C.Two pills.

D.A small box.小题3:The vet taught the farmer how _________.

A.to blow the tube

B.to make the cow take the pills

C.to take the medicine

D.to put the tube in his mouth小题4:Which of the following is true?

A.The farmer ate the pills himself.

B.The cow got better after taking the medicine.

C.The vet came to help the farmer change the cow the next day.

D.The farmer was working outside his house the next day.