Question 1

Which compound reacts with 2,4-dinitrophenylhydrazine reagent but does not react with Tollens’ reagent?

  A  

CH3COCO2H

  B  

CH3CH(OH)CHO

  C  

CH3COCHO

  D  

CH3CH(OH)CH3

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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

Alcohol Y gives product Z after mild oxidation. Z gives a positive result with Tollens’ reagent and with 2,4-dinitrophenylhydrazine reagent.

What could be the identity of alcohol Y?

  A  

butan-1-ol

  B  

butan-2-ol


  C  

butan-2,3-diol


  D  

2-methylbutan-2-ol

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Question 4

A compound, Q, gives an orange precipitate with 2,4-dinitrophenylhydrazine.

Compound Q is resistant to oxidation.

On reduction, Q gives a product made up of a pair of optical isomers.

Which of the following compounds could be compound Q?

  A  

CH3CH2CH2COCH3


  B  

CH3CH=CHCH(OH)CH3


  C  

CH3CH2CH2CH2CHO

  D  

CH3CH2COCH2CH3


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