Alkanes and Alkenes in Organic Chemistry
Catalyst (broken clay pot
or aluminium oxide (Al
2
O
3
)
Decane
(what is the
formula?______________)
water
Decane
(what is the formula?______________)
What is the Structural formula - Draw in your jotter)
Decane
Draw 4 isomers of decane
When we “crack” DECANE what are the possible products formed?
How do you prove you have formed these products?
H
Annapurna
Pentene
CH
3
CH
2
CH
2
CH=CH
2
Alkenes
Can be
Hydrocarbons
Saturated
(Single Bonds)
Can be
Unsaturated
(Double Bond)
Ethene
CH
2
=CH
2
Alkanes
Cycloalkanes
Saturated or Unsaturated?
CH
2
CHCH
3
S
a
t
u
r
a
t
e
d
S
a
t
u
r
a
t
e
d
S
a
t
u
r
a
t
e
d
U
n
s
a
t
u
r
a
t
e
d
U
n
s
a
t
u
r
a
t
e
d
Bromine Water
Br
Br
Double Bonds
Undergo
Addition Reactions
In Addition Reactions
The double bond
Breaks and bromine atoms
are added to both sides
of the double bond
Addition of Hydrogen
(H
2
)
H
H
The double bond
Breaks and Hydrogen atoms
are added to both sides
of the double bond
Propene + Hydrogen
Propane
Alkenes into Alkanes
Hexene + Hydrogen
C
6
H
12
H
2
+
Hexane
C
6
H
14
Now write this
reactions using the
Structural
Formulae
1.
Alkenes into Alkanes
Octene + Hydrogen
Octane
C
8
H
16
H
2
+
C
8
H
18
2.
Saturated?
C
2
H
6
C
4
H
10
C
20
H
42
C
10
H
20
C
15
H
30
C
8
H
18
C
7
H
14
C
60
H
122
C
11
H
22
?
?
?
?
C
4
H
8
?
Alkenes and Cycloalkanes
Isomers from different Homologous Series
C
n
H
2n
Alkenes
Cyclo-
alkanes
Unsaturated
Saturated
C
4
H
8
C
4
H
8
Butene
Cyclobutane
Unsaturated
Saturated
Reacts with
Bromine
Unreactive
No Reaction with
Bromine
C
5
H
10
►
Describe how you could find out, which test
tube contained pentene and which test tube
contained cyclopentane
A
B
Pentene
Cyclopentane
►
Only Tube A decolourised bromine water.
Only Tube A decolourised bromine water.
Bromine Water
►
Alkenes react with Bromine water.
►
The bromine water changes from brown to clear.
►
Tube A must contain Pentene
Alkene
Bromine
Water
Alkane
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Explore the properties and reactions of decane, catalysts, isomers, and addition reactions of alkenes in this comprehensive guide. Learn about saturated and unsaturated hydrocarbons and witness the transformation from alkenes to alkanes through different chemical processes.
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Presentation Transcript
Decane (what is the formula?______________) Catalyst (broken clay pot or aluminium oxide (Al2O3) water
Decane (what is the formula?______________) What is the Structural formula - Draw in your jotter) H H H H H H H H H H H C C C C H C C C C C C H H H H H H H H H H
H H H H H H H H H H H C C C C H C C C C C C H H H H H H H H H H Decane Draw 4 isomers of decane c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c
When we crack DECANE what are the possible products formed? How do you prove you have formed these products? H H H H H H H H H H H C C C C H C C C C C C H H H H H H H H H H H H H H H H H H H H H C c c C C C H C C H C C H H H H H H H H H
Alkanes Saturated (Single Bonds) Cycloalkanes Can be Can be Hydrocarbons Unsaturated (Double Bond) Ethene CH2=CH2 Alkenes Pentene CH3CH2CH2CH=CH2
Saturated or Unsaturated? H H Saturated H H Saturated H H H H C C C C C H C H C H H H H H H H H H CH2 CH2CH2 Saturated CH2 H C Unsaturated C C CH2CHCH3 Unsaturated H H
Bromine Water Double Bonds Undergo Addition Reactions Br Br H H H C C C In Addition Reactions The double bond Breaks and bromine atoms are added to both sides of the double bond H H H
Addition of Hydrogen (H2) The double bond Breaks and Hydrogen atoms are added to both sides of the double bond H H H H H C C C H H H Propene + Hydrogen Propane
Alkenes into Alkanes Now write this reactions using the Structural Formulae 1. Hexene + Hydrogen Hexane C6H12 H2 + C6H14 H H H H H H H H H H H H C C C H H C C C C H C C C H C C H H H H HH H H HH H H
Alkenes into Alkanes 2. Octene + Hydrogen Octane C8H16 H2 C8H18 + H H H H H H H H H H H H H H H H C C C C H H C C C C C H C C C C H C C C H H H HH HH HH H H HH HH H
Saturated? ? C2H6 C10H20 C4H10 C4H8? C4H8? C8H18 C7H14 ? C20H42 ? C11H22 C15H30 C60H122 ?
Alkenes and Cycloalkanes Isomers from different Homologous Series Unsaturated C4H8 Alkenes CnH2n Cyclo- alkanes Saturated C4H8
C4H8 Saturated Unsaturated CH2 CH2CH2 Cyclobutane CH2 H H H H H C C C C H H H Unreactive No Reaction with Bromine Butene Reacts with Bromine
C5H10 A B Pentene Cyclopentane Describe how you could find out, which test tube contained pentene and which test tube contained cyclopentane Only Tube A decolourised bromine water.
Bromine Water Alkenes react with Bromine water. The bromine water changes from brown to clear. Tube A must contain Pentene Alkene Alkane Bromine Water
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