5 2-Bromobutane, CH3CH₂CHBrCH3, can be prepared by three different methods. The relative molecular mass, M,, of 2-bromobutane is 136.9. (a) 2-Bromobutane can be prepared by reacting butane with bromine (Reaction 5.1). CH₂CH₂CH₂CH₂ + Br₂ → CH₂CH₂CHBrCH3 + HBr Reaction 5.1 The reaction is initiated by the formation of bromine radicals from bromine. (i) State the conditions for the formation of bromine radicals from bromine. (ii) Write two equations for the propagation steps in the mechanism for Reaction 5.1. Use structural formulae for organic species and dots (•) for unpaired electrons on radicals. CH3CH₂CH₂CH3 (iii) The yield of CH3CH₂CHBRCH3 is only 30%. Suggest two reasons why the yield of CH3CH₂CHBrCH3 is so low. 1 2
5 2-Bromobutane, CH3CH₂CHBrCH3, can be prepared by three different methods. The relative molecular mass, M,, of 2-bromobutane is 136.9. (a) 2-Bromobutane can be prepared by reacting butane with bromine (Reaction 5.1). CH₂CH₂CH₂CH₂ + Br₂ → CH₂CH₂CHBrCH3 + HBr Reaction 5.1 The reaction is initiated by the formation of bromine radicals from bromine. (i) State the conditions for the formation of bromine radicals from bromine. (ii) Write two equations for the propagation steps in the mechanism for Reaction 5.1. Use structural formulae for organic species and dots (•) for unpaired electrons on radicals. CH3CH₂CH₂CH3 (iii) The yield of CH3CH₂CHBRCH3 is only 30%. Suggest two reasons why the yield of CH3CH₂CHBrCH3 is so low. 1 2
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter10: Fuels, Organic Chemicals, And Polymers
Section10.1: Petroleum
Problem 10.1E: Heptane, C7H16, can be catalytically reformed to make toluene, C6H5CH3, another seven-carbon...
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