Transcript Chemical Reactions of Alkanes and Alkenes 1. Structure cyclohexane cyclohexene CH2 CH2 H2C CH2 CH2 HC H2C HC CH2 CH2 Or H H CH2 Or H H H C CH2 H H H C H C C H C C H H C C H C C H C H H H H H C H H H Table: 2-7 Cyclohexane Polarity Non-polar Solubility Insoluble H2SO4 None Br2 before Orange Br2 after Orange KMnO4 Purple KMnO4 Purple Cyclohexene Non-polar Insoluble Cloudy Orange Colourless Purple Brown.

Chemical Reactions of
Alkanes and Alkenes
1. Structure
cyclohexane
cyclohexene
CH2
CH2
H 2C
CH2
CH2
HC
H 2C
HC
CH2
CH2
Or
H
H
CH2
Or
H
H
H
C
CH2
H
H
H
C
H
C
C
H
C
C
H
H
C
C
H
C
C
H
C
H
H
H
H
H
C
H
H
H
Table: 2-7
Cyclohexane
Polarity
Non-polar
Solubility
Insoluble
H2SO4
None
Br2 before
Orange
Br2 after
Orange
KMnO4
Purple
KMnO4
Purple
Cyclohexene
Non-polar
Insoluble
Cloudy
Orange
Colourless
Purple
Brown
Question 1 - 5
1. Insoluble because they are non-polar.
Water is polar. Like-dissolves-like.
2. Alkanes: unreactive, Alkenes: most
3. A double bond has both
4. Weaker, projects outward
5. a) addition
b) it was the (acid) catalyst
c) accelerates a reaction without being
used up
5 d) Cyclohexene + H2SO4 + H2O
H
H
C
C
C
H
C
C
C
H
H
H
H
H
H
H
+
H
H
H2O
H
H
C
catalyst H
C
C
OH
H
C
C
H
C
H
H
H
H
cyclohexanol
e) Found in water because it has a polar
moiety (it is polar)
f) cyclohexanol (the product / the one to the
right)
6 a-d: Cyclohexene + Br2
a) Orange
b) Addition
c)
H
H
C
C
C
H
C
C
C
H
H
H
H
H
H
H
+
H
H
H
H
C
H
C
C
Br
H
C
C
Br
Br Br
C
H
H
d) Bromine was used up (disappeared)
H
H
7 : Cyclohexene + KMnO4
H
H
C
C
C
H
C
C
C
H
H
H
H
H
H
H
+
H
H
H
H
C
KMnO4
H
C
C
OH
H2O
H
C
C
OH
C
H
H
H
H
+ KOH + MnO2
C. Cyclohexene + Br
H
H
C
C
C
H
C
C
C
H
H
H
H
H
H
H
+
H
H
H
H
C
H
C
C
Br
H
C
C
Br
Br Br
C
H
H
H
H
Isomers: cis-1,2-dibromocyclohexane
trans-1,2-dibromocyclohexane
E. Cyclohexene + KMnO4
H
H
H
H
C
H
H
C
C
H
C
C
C
H
H
H
+
H
H
H
H
C
KMnO4
H
C
C
OH
H2O
H
C
C
OH
C
H
H
H
H
Isomers: cis-1,2-cyclohexanediol
trans-1,2-cyclohexanediol
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