CIE AS Chemistry: Carboxylic Acids
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Questions and Answers

What is formed when a nitrile is hydrolyzed by dilute acid?

  • A sodium carboxylate salt and ammonium ion
  • A carboxylic acid and ammonia
  • A carboxylic acid and ammonium salt (correct)
  • A sodium carboxylate salt and ammonia

    • What is the functional group present in carboxylic acids?

  • -OH
  • -CHO
  • -CO
  • -COOH (correct)

    • Which of the following reactions can be used to prepare carboxylic acids?

  • Reduction of primary alcohols
  • Oxidation of primary alcohols and aldehydes (correct)
  • Decomposition of carboxylates
  • Hydrolysis of esters

    • What is the purpose of acidification in the hydrolysis of nitriles by dilute alkali?

    <p>To change the carboxylate ion into a carboxylic acid</p> Signup and view all the answers

    What is the colour of the dichromate ions in K2Cr2O7?

    <p>Orange</p> Signup and view all the answers

    What is the product of the condensation reaction between an alcohol and a carboxylic acid?

    <p>An ester</p> Signup and view all the answers

    What is the result of converting the -CN group to a -COOH group?

    <p>Formation of a carboxylic acid</p> Signup and view all the answers

    What is the product of the oxidation of primary alcohols and aldehydes?

    <p>Carboxylic acids</p> Signup and view all the answers

    What is the final product of the hydrolysis of nitriles, regardless of the method used?

    <p>A carboxylic acid</p> Signup and view all the answers

    What is the role of acidified K2Cr2O7 and acidified KMnO4 in the preparation of carboxylic acids?

    <p>Oxidising agents</p> Signup and view all the answers

    What is the colour of the MnO4- ions in KMnO4?

    <p>Purple</p> Signup and view all the answers

    What is the result of the hydrolysis of esters by dilute acid?

    <p>Formation of a carboxylic acid and an alcohol</p> Signup and view all the answers

    What is the characteristic of carboxylic acids in water?

    <p>They partially dissociate in water</p> Signup and view all the answers

    What is the pH value of a carboxylic acid solution?

    <p>Less than 7</p> Signup and view all the answers

    What is the result of the hydrolysis of esters by dilute alkali and heat followed by acidification?

    <p>Formation of a carboxylic acid and an alcohol</p> Signup and view all the answers

    What type of reaction does carboxylic acid undergo with alkali?

    <p>Neutralisation reaction</p> Signup and view all the answers

    What is the purpose of acidification in the hydrolysis of esters by dilute alkali and heat?

    <p>To change the carboxylate ion into a carboxylic acid</p> Signup and view all the answers

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