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(Solved): PART C. Experimental Procedure NS In this part of the experiment you will distinguish the major chem ...
PART C. Experimental Procedure NS In this part of the experiment you will distinguish the major chemical reactivity between a saturated hydrocarbon and unsaturated hydrocarbon. The unsaturated hydrocarbons (alkenes, cycloalkenes) give addition reactions with bromine. However, saturated hydrocarbons (alkanes and aromatics) give substitution reaction with bromine in presence of a Freidel-Craft catalyst such as AlCl3. Substitution Reaction: CH4 + Br2 → CH3Br + HBr Addition Reaction: MATERIALS H C=C H H PROCEDURE H 1. Obtain three small test tubes. + Br-Br - In the addition reaction the orange red color of bromine will disappear which is a positive test for an unsaturated hydrocarbon. SAFETY HH 11 →H-C-C-H Organic compounds are highly flammable. Use only small quantities. They are toxic and can be absorbed through the skin. Avoid contact; wash if any chemical spills on your person. Bromine water is corrosive and toxic. Perform the experiment in a fume hood and wear gloves when working with these chemicals. DO NOT POUR ANY CHEMICALS INTO THE SINK. INSTEAD POUR THEM INTO THE DESIGNATED WASTE BOOTLES AS DIRECTED BY YOUR INSTRUCTOR. I Br Br Toluene, cyclohexene, cyclohexane, bromine solution in methylene chloride (1%), test tubes. 2. Using a pipet place 5 drops of cyclohexane in the first test tube, 5 drops of cyclohexene in the second test tube and 5 drops of toluene in the third test tube. 3. Using a different pipet add one drop of bromine solution (in methylene chloride) in each test tube and observe the reaction. 4. Distinguish the cyclohexene from toluene and cyclohexane. 5. Next, add a small sample of iron dust in the test tubes containing the cyclohexane and toluene. Wait couple of minutes and record your observations.
6. Based on your observations, develop a flow chart for the experimental procedures.
In this part of the experiment you will distinguish the major chemical reactivity between a saturated hydrocarbon and unsaturated hydrocarbon. The unsaturated hydrocarbons (alkenes, cycloalkenes) give addition reactions with bromine, However, salurated hydrocarbons (alkanes and aromaties) give substitution reaction with bromine in presence of a Freidel-Cratt catalyst such as AICh. Substitution Reaction: Addition Reaction: In the addition reaction the orange red color of bromine will disappear which is a positive test for an unsaturated hydrocarbon. SAFETY Organic compounds are highly flammable. Use only small quantitics. They are toxic and can be absorbed through the skin. Avoid contact; wash if any chemical spills on your person. Bromine water is corrosive and toxic. Perform the experiment in a fume hood and wear gloves when working with these chemicals. DO NOT POUR ANY CHEMICALS INTO THE SINK. INSTEAD POUR THEM INTO THE DESIGNATED WASTE BOOTLES AS DIRECTED BY YOUR INSTRUCTOR. MATERIALS Toluene, cyclohexene, cyclohexane, bromine solution in methylene chloride (1\%), test tubes. PROCEDURE 1. Obtain three small test tubes. 2. Using a pipet place 5 drops of cyclohexane in the first test tube, 5 drops of cyclohexene in the second test tube and 5 drops of toluene in the third test tube. 3. Using a different pipet add one drop of bromine solution (in methylene chloride) in each test tube and observe the reaction. 4. Distinguish the cyclohexene from toluene and cyclohexane. 5. Next, add a small sample of iron dust in the test tubes containing the cyclohexane and toluene. Wait couple of minutes and record your observations. 6. Based on your observations, develop a flow chart for the experimental procedures.