Question 1

Compound X, CH3CH(OH)CH(CHO)CH3, is heated under reflux with an excess of acidified K2Cr2O7 to form compound Y.

Both X and Y are separately warmed with Fehling’s solution and the observations noted.

What are the observations?

  A  

both X and Y give a red precipitate

  B  

only X gives a red precipitate

  C  

only Y gives a red precipitate

  D  

neither X nor Y gives a red precipitate

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Question 2

Compound X produces a carboxylic acid when heated under reflux with acidified potassium dichromate(VI). Compound X does not react with sodium metal.

What could be the identity of compound X?

  A  

propanal

  B  

propanone

  C  

propan-1-ol


  D  

propan-2-ol

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Question 3

Which reagent cannot be used to distinguish between ethanal and propanone?

  A  

acidified sodium dichromate(VI) solution

  B  

alkaline aqueous iodine


  C  

cold acidified potassium manganate(VII) solution


  D  

Fehling’s reagent

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