问题 选择题

下列说法正确的是(   )

A.煤中含有苯和甲苯,可用分馏的方法把它们分离出来

B.C7H16的烷烃中,含有3个甲基的同分异构体有2种

C.碳原子数小于或等于8的单烯烃中,与HBr加成产物只有一种结构,符合条件的单烯烃有6种

D.某烃的分子式为C10H14,它不能使溴水褪色,但可使酸性KMnO4溶液褪色,且分子结构中只有一个烷基,符合条件的烃有3种

答案

答案:D

题目分析:A、煤中不含苯和甲苯,煤干馏后从煤焦油中能分离出来苯和甲苯,苯和甲苯沸点不同,可以用蒸馏的方法进行分离,不正确;B、C7H16的烷烃中含有3个甲基,说明有一个侧链,当侧链为甲基时,有2种同分异构,当侧链为乙基时又存在一种,含有3个甲基的同分异构体共3种,不正确;C、C原子数小于等于8的单烯烃与HBr反应,其加成产物只有一种结构,那么该烯烃的结构必定是对称的,其碳原子数也必定是偶数,C2一种,C4一种,C6两种,C8三种,共7种异构,不正确; D、分子式满足苯的同系物通式,结构中存在一个苯环,一个侧链,丁基有三种异构,正确。

完形填空
完形填空。
     A Frenchman went to visit New York. He didn't know English. When he   1   New York, he   2   a
bus to a hotel.
     It was Sunday. The Frenchman went out for a walk. As he went   3   the street, he suddenly thought
of his way back. So he decided to write down the name of the street. On the wall near the corner of the
street, he saw some English words. He wrote them down in his notebook. "Now I know the name of the
street," he said to   4   . "It'll be easy for me to   5   the hotel." He walked for a long time in the city, then
he felt tired and wanted to go back. He took the notebook out of his pocket and   6       the name of the
street to a young man. The young  man read the words, but he didn't know what the Frenchman wanted.
The Frenchman decided to ask   7   . He stopped an old man. The old man read the words but he didn't
know what the Frenchman wanted,  8  .
     Then the Frenchman saw  a young woman. The  young  woman  knew      9         French. When  the
Frenchman showed her words in his notebook and asked where the street was, the young woman   10   ,
for in the Frenchman's notebook, there were only three words, "One Way Street"- it was not a street
name.
( )1. A. reached to  
( )2. A. had        
( )3. A. along      
( )4. A. a policeman
( )5. A. come to    
( )6. A. read        
( )7. A. himself    
( )8. A. too        
( )9. A. a little    
( )10.A. cried      
B. got      
B. took      
B. across    
B. the man  
B. walk to  
B. put      
B. someone  
B. either    
B. some      
B. laughed  
C. arrived in        
C. drove            
C. away              
C. himself          
C. return to        
C. showed            
C. others            
C. neither          
C. many              
C. thought          
单项选择题