Butan-1-ol can be oxidised by acidified potassium dichromate( VI) using two different methods. (a) In the first method, butan-1-ol is added dropwise to acidified potassium dichromate( VI) and the product is distilled off immediately. (i) Using the symbol [O] for the oxidising agent, write an equation for this oxidation of butan-1-ol, showing clearly the structure of the product. State what colour change you would observe. Equation ........................................................................................................... Colour change .................................................................................................. (ii) Butan-1-ol and butan-2-ol give different products on oxidation by this first method. By stating a reagent and the observation with each compound, give a simple test to distinguish between these two oxidation products. Reagent ............................................................................................................. Observation with oxidation product of butan-1-ol ........................................................................................................................... Observation with oxidation product of butan-2-ol ...........................................................................................................................(6) (b) In a second method, the mixture of butan-1-ol and acidified potassium dichromate( VI) is heated under reflux. Identify the product which is obtained by this reaction. .....................................................................................................................................(1) (c) Give the structures and names of two branched chain alcohols which are both isomers of butan-1-ol. Only isomer 1 is oxidised when warmed with acidified potassium dichromate (VI). Structure of isomer 1 Structure of isomer 2 Name of isomer 1 Name of isomer 2
- Butan-1-ol can be oxidised by acidified potassium dichromate( VI) using two different methods.
(a) In the first method, butan-1-ol is added dropwise to acidified potassium dichromate( VI) and the product is distilled off immediately.
(i) Using the symbol [O] for the oxidising agent, write an equation for this oxidation of butan-1-ol, showing clearly the structure of the product.
State what colour change you would observe.
Equation ...........................................................................................................
Colour change ..................................................................................................
(ii) Butan-1-ol and butan-2-ol give different products on oxidation by this first method. By stating a reagent and the observation with each compound, give a simple test to distinguish between these two oxidation products.
Reagent .............................................................................................................
Observation with oxidation product of butan-1-ol
...........................................................................................................................
Observation with oxidation product of butan-2-ol
...........................................................................................................................(6)
(b) In a second method, the mixture of butan-1-ol and acidified potassium dichromate( VI) is heated under reflux. Identify the product which is obtained by this reaction.
.....................................................................................................................................(1)
(c) Give the structures and names of two branched chain alcohols which are both isomers of butan-1-ol. Only isomer 1 is oxidised when warmed with acidified potassium dichromate (VI).
Structure of isomer 1 Structure of isomer 2
Name of isomer 1 Name of isomer 2
................................................. .................................................
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