Paper 2 Organic and Physical Chemistry
Name and outline the mechanism for the reaction of cyclohexane with Br2Electrophilic addition and check mark scheme Explain why there is an attraction between C=C double bond and Br2The double bond is a region of high electron density as the br molecule approach is it it becomes polarised the br positive is attracted to the double bond inducing a temporary dipole Draw the skeletal formula of the halogenoalkane formed when buta-1,3 diene reacts with an excess of Br 2 CH2=CHCH=CH2Butane structure with 4 points connecting to Br The propanone is removed from the reaction mixture by distillation there are three problems with the apparatus. Identify the problem describe and suggest how the problem can be solvedThere are no anti-bumping granules to prevent large bubbles in the mixture. The flask is open which means the mixture could evaporate and gases. He should be closed with a bang. There is no thermometer which should be used so the temperature stays constant. The water is flowing into the condenser in the wrong direction. Condenser is not cool enough. State the benefit to life on Earth of ozone in the upper atmosphereIt absorbs UV radiation
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