Chemistry
Reactions of some Hydrocarbons
Equipment Required:
-4 Test tubes
-Dropper
- Cyclohexane (C6H12) (3ml)
- Cyclohexene (C6H10) (3ml)
- Toluene (CH3C6H5) (3ml)
- Potassium Permanganate solution (KMnO4) .01 mol L-1 (4ml)
- Sulfuric Acid (H2SO4) 2mol L-1 (2ml)
- Bromine Water (Br2) (5ml)
Procedure:
Reaction of hydrocarbons with acidified permanganate:
1) Into three separate, labeled test tubes place 1 ml of cyclohexane, cyclohexene and toluene respectively.
2) In a separate test tube add 4 ml of 0.01mol L-1 KMnO4 to 2 ml of 2mol L-1 H2SO4
3) Add 1 ml of this acidified KMnO4 solution to each of the test tubes containing the hydrocarbons. Shake each test tube gently and record any change that takes place in the aqueous layer over about 5 minutes.
Reaction of hydrocarbons with bromine water:
1) Into three separate, labeled test tubes place 1 ml of cyclohexane, cyclohexene and toluene respectively.
2) Add 1 ml of bromine water to each of the test tubes containing the hydrocarbons. Shake each test tube gently and record any color change in each case.
Results:
Reaction of hydrocarbons with acidified permanganate:
Toluene: Two clear layers, bottom layer of purple coloration, top layer transparent.
Cyclohexane: Two clear layers, bottom layer of purple coloration, top layer transparent.
Cyclohexene: Completely decolorized.
Reaction of hydrocarbons with bromine water:
Toluene: Two layers, top layer an opaque yellow, the bottom a transparent yellow.
Cyclohexane: Two layers, top layer a bright orange color, the bottom a yellow color.
Cyclohexene: Completely Decolorized
Discussion:
1) Assuming the reactions of these hydrocarbons are typical of the classes of compounds which they belong what can you say about the relative relativities of the three classes?
The Alkenes are the most reactive type of hydrocarbon as in both reactions , they decolorized when bromine water was added, of which is usually brown, and when potassium
Equipment Required:
-4 Test tubes
-Dropper
- Cyclohexane (C6H12) (3ml)
- Cyclohexene (C6H10) (3ml)
- Toluene (CH3C6H5) (3ml)
- Potassium Permanganate solution (KMnO4) .01 mol L-1 (4ml)
- Sulfuric Acid (H2SO4) 2mol L-1 (2ml)
- Bromine Water (Br2) (5ml)
Procedure:
Reaction of hydrocarbons with acidified permanganate:
1) Into three separate, labeled test tubes place 1 ml of cyclohexane, cyclohexene and toluene respectively.
2) In a separate test tube add 4 ml of 0.01mol L-1 KMnO4 to 2 ml of 2mol L-1 H2SO4
3) Add 1 ml of this acidified KMnO4 solution to each of the test tubes containing the hydrocarbons. Shake each test tube gently and record any change that takes place in the aqueous layer over about 5 minutes.
Reaction of hydrocarbons with bromine water:
1) Into three separate, labeled test tubes place 1 ml of cyclohexane, cyclohexene and toluene respectively.
2) Add 1 ml of bromine water to each of the test tubes containing the hydrocarbons. Shake each test tube gently and record any color change in each case.
Results:
Reaction of hydrocarbons with acidified permanganate:
Toluene: Two clear layers, bottom layer of purple coloration, top layer transparent.
Cyclohexane: Two clear layers, bottom layer of purple coloration, top layer transparent.
Cyclohexene: Completely decolorized.
Reaction of hydrocarbons with bromine water:
Toluene: Two layers, top layer an opaque yellow, the bottom a transparent yellow.
Cyclohexane: Two layers, top layer a bright orange color, the bottom a yellow color.
Cyclohexene: Completely Decolorized
Discussion:
1) Assuming the reactions of these hydrocarbons are typical of the classes of compounds which they belong what can you say about the relative relativities of the three classes?
The Alkenes are the most reactive type of hydrocarbon as in both reactions , they decolorized when bromine water was added, of which is usually brown, and when potassium