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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_nH_2n
name ends in "ene"
prefix determined by the number of carbon atoms in the chain:

eth	C₂
prop	C₃
but	C₄
pent	C₅
hex	C₆
hept	C₇
oct	C₈
non	C₉
dec	C₁₀

Animated Tutorial

Examples

Name

no. C atoms
(n)

no. H atoms
(2 x n)

Formula

Structure

ethene

2 x 2 = 4

C₂H₄

H \|		H \|
C	=	C
\| H		\| H

propene

2 x 3 = 6

C₃H₆

H \|				H \|
C	=	C	-	C	-H
\| H		\| H		\| H

1-butene

2 x 4 = 8

C₄H₈

H \|				H \|		H \|
C	=	C	-	C	-	C	-H
\| H		\| H		\| H		\| H

1-pentene

2 x 5 = 10

C₅H₁₀

H \|				H \|		H \|		H \|
C	=	C	-	C	-	C	-	C	-H
\| H		\| H		\| H		\| H		\| H

1-hexene

2 x 6 = 12

C₆H₁₂

H
|

-H

|
H

1-heptene

2 x 7 = 14

C₇H₁₄

H
|

-H

|
H

1-octene

2 x 8 = 16

C₈H₁₆

H
|

-H

|
H

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