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Chemistry · Oct / Nov 2020 · Paper 12 · Question 38

5070Carboxylic acids

The diagram shows the structure of a compound called ethanoic anhydride. [structure of ethanoic anhydride] 1 mol of ethanoic anhydride reacts with water to form 2 mol of a carboxylic acid only. This carboxylic acid reacts with ethanol to form an ester. How many moles of water react with 1 mol of the ethanoic anhydride and what is the structure of the ester?

  1. Anumber of moles of water: 1; structure of the ester: CH3CH2C(=O)OCH2CH3
  2. Bnumber of moles of water: 1; structure of the ester: CH3C(=O)OCH2CH3
  3. Cnumber of moles of water: 2; structure of the ester: CH3CH2C(=O)OCH2CH3
  4. Dnumber of moles of water: 2; structure of the ester: CH3C(=O)OCH2CH3

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Correct answer: B. number of moles of water: 1; structure of the ester: CH3C(=O)OCH2CH3

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