Would anyone be able to have a look at these questions, and explain how you get to the answers? Thanks in advance.
1. This question concerns the preparation of 1-bromobutane from butan-1-ol, 50% sulfuric acid and sodium bromide. The mixture was placed in a flask and heated under reflux for ten minutes.
Boiling temperature / °C
(a) The reason that 50% sulfuric acid was used rather than concentrated sulfuric acid is because concentrated sulfuric acid
A would oxidise some of the bromide ions to bromine.
B would cause the reaction to go too fast.
C would react with the bromide ions to produce hydrogen bromide.
D is too hazardous a chemical.
(b) The reaction mixture was distilled. The impure distillate did not contain
C sodium bromide
D hydrogen bromide
(c) The impure 1-bromobutane was washed with concentrated hydrochloric acid and shaken in a tap funnel with a base to remove acidic impurities. Which of the following would remove acidic impurities without reacting with the 1-bromobutane?
A calcium hydroxide solution
B sodium hydroxide solution
C calcium chloride solution
D sodium hydrogencarbonate solution
(d) The 1-bromobutane was washed with water, dried and distilled. Which of the following is the correct procedure?
A heat the liquid to 118 °C and collect the substance given off
B heat the liquid to 100 °C and collect the substance given off
C boil the liquid and collect the fraction that boils off between 116 and120 °CD boil the liquid and collect the fraction that boils off between 98 and102 °C
Chemistry Questions - organics Watch
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- 21-03-2013 17:56