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An organic compound J has the following percentage by mass, carbon 64.86%, hydrogen 13.51% and the rest is oxygen. The relative molecular mass of the compound is 74. C = 12, O = 16, H = 1)

  1. Work out the molecular formula of compound J. 
  2. To which homologous series does compound J belong? 
  3. Write a balanced chemical equation for the reaction that occurs when compound J reacts with sodium metal. 
  4. Name the type of reaction indicated in b(iii) above. 
  5. Name the organic compound formed when J reacts with excess acidified potassium managanate (VII).

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  1. Work out the molecular formula of compound J. 
     CarbonHydrogenOxygen
     % 64.8613.51  100-78.37=21.63
     Moles 64.86/12=5.405 13.51/1=13.51 21.63/16=1.352
     Moles 5.405/1.352=4 13.51/1.352=10 1.352/1.352=1
     Empirical
    formula
     C4H10O (C4H10O)=74 
      74n=74
    n=1  
    Molecular formular =C4H10O
  2. To which homologous series does compound J belong? 
    • Alkanols // Alcohols
  3. Write a balanced chemical equation for the reaction that occurs when compound J reacts with sodium metal. 
    • 2C4H10O(l) + 2Na(s) 2C4H9ONa(aq) + H2(g)
  4. Name the type of reaction indicated in b(iii) above. 
    • Displacement
  5. Name the organic compound formed when J reacts with excess acidified potassium managanate (VII). 
    • Butanoic acid
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