Naming Simple Alkenes 
Key Concepts
 alkenes are hydrocarbons: made up of only carbon and hydrogen atoms
 there is a double bond between 2 carbon atoms
 general formula: C_{n}H_{2n}
 name ends in "ene"
 prefix determined by the number of carbon atoms in the chain:
eth 
C_{2} 
prop 
C_{3} 
but 
C_{4} 
pent 
C_{5} 
hex 
C_{6} 
hept 
C_{7} 
oct 
C_{8} 
non 
C_{9} 
dec 
C_{10} 
Animated Tutorial
Examples
Name 
no. C atoms (n) 
no. H atoms (2 x n) 
Formula 
Structure 
ethene 
2 
2 x 2 = 4 
C_{2}H_{4} 


propene 
3 
2 x 3 = 6 
C_{3}H_{6} 

H  



H  


C 
= 
C 
 
C 
H 

 H 

 H 

 H 



1butene 
4 
2 x 4 = 8 
C_{4}H_{8} 

H  



H  

H  


C 
= 
C 
 
C 
 
C 
H 

 H 

 H 

 H 

 H 



1pentene 
5 
2 x 5 = 10 
C_{5}H_{10} 

H  



H  

H  

H  


C 
= 
C 
 
C 
 
C 
 
C 
H 

 H 

 H 

 H 

 H 

 H 



1hexene 
6 
2 x 6 = 12 
C_{6}H_{12} 

H  



H  

H  

H  

H  


C 
= 
C 
 
C 
 
C 
 
C 
 
C 
H 

 H 

 H 

 H 

 H 

 H 

 H 



1heptene 
7 
2 x 7 = 14 
C_{7}H_{14} 

H  



H  

H  

H  

H  

H  


C 
= 
C 
 
C 
 
C 
 
C 
 
C 
 
C 
H 

 H 

 H 

 H 

 H 

 H 

 H 

 H 



1octene 
8 
2 x 8 = 16 
C_{8}H_{16} 

H  



H  

H  

H  

H  

H  

H  


C 
= 
C 
 
C 
 
C 
 
C 
 
C 
 
C 
 
C 
H 

 H 

 H 

 H 

 H 

 H 

 H 

 H 

 H 



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