1 2 3 I need discussion for this experiment ... you can take the procedure from
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I need discussion for this experiment ... you can take the procedure from second and third page ....( please write the discussion in by computer line .. not by your hand )
EXPERIMENT 4 Preparation of Cyclohexene, and Tests for Unsaturation 1. Theoretical Background One general synthetic method used to prepare alkene involves dehydration of an alcohol OH H, heat -boiling mineral acid, such as sulfuric or phosphoric cid, is the catalyst for the reaction. The acid protonates the alcohol A strong and high Subsequently, a molecule of water and a proton are eliminated H-C-C- tertiary or has other structural features that stabilize If the alcohol is the corresponding carbocation, the elimination usually proceeds stepwise (El mechanism). Alternatively, if the alcohol is primary, the loss of HO and H usually occurs in one step (E2 mechanism). If the alcohol is secondary, either mechanism is possible. If the carbons that are bonded to the carbon to different numbers of protons bonded to them, it is possible to obtain two or more different alkenes. In the experiment you will perform, this complication is avoided by using a symmetrically substituted alcohol which the hydroxyl group is attached have 2. Cyclohexene from Cyclohexanol In this experiment the secondary alcohol cyclohexanol will be dehydrated to cyclohexeneExplanation / Answer
Test for unsaturation in cyclohexene and compare to cyclohexane
Cyclohexene has 1 double bond in it.
To confirm for this unsaturation, we would run few chemical tests on cyclohexene. Cyclohexene undergoes addition reaction.
The first one being addition of Br2 to cyclohexene. Bromine is deep brown in color in CCl4 solution. When it reacts with cyclohexene we get disappearence of the deep brown color and this tells us that bromine is consumed in the process. Cyclohexane on the other hand did not show any such decolorization.
Second test is baeyer test, wherein, we convert the alkene to a vicinal diol product using KMnO4 solution. The original color of KMnO4 is violet which gets lost as the reaction progresses and we get a brownish color due to MnO2. Cyclohexene shows this color change upon reaction with KMnO4 and thus confirms the presence of unsaturation in the system. Cyclohexane again did not show disappearence of violet color of KMnO4.
Third test is sulfuric acid test, wherein, alkenes react with 1 mole of H2SO4 to form alkane hydrogen sulfate. cyclohexene shows this reaction whereas, cyclohexane fails to give a positive test with H2SO4. Confirming presence of unsaturation in cyclohexene and absence in cyclohexane.
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