BROMINATION: SELECTIVITY OF HYDROGEN ATOM ABSTRACTION OChem Lab - Will rate!! se

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BROMINATION: SELECTIVITY OF HYDROGEN ATOM ABSTRACTION

OChem Lab - Will rate!!

see here for short lab reading: http://imgur.com/a/A8bd9

5. Determine the average ratio of Br2 to hydrocarbon to be used in this experiment. To perform the calculation, assume that the hydrocarbon has a density of 0.8 and a molecular weight of 100. SHOW your work.

6. Why are the hydrocarbons to be used in excess in this experiment?

7. Why is the bromine that is to be added to each test tube in this experiment measured out as a solution of bromine in dichloromethane rather than as pure bromine?

Explanation / Answer

5) bromine will react with hydrocarbon in 1:1 molar ratio.

So molecular weight of hydrocarbon = 100

Mol wt of bromine = 159.8

so the ratio of mass = Br2 : Hydrocarbon = 159.8 / 100 = 1.59 : 1

6) we use hydrocarbon in excess, so that we can bring out only monosubstitution of hydrocarbon

7) It is hazardous and corrosive in nature. Pure bromine is volatile, and difficult to measure out exactly.

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