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 (C)</p> Signup and view all the answers

What is the colour of the dichromate ions in K2Cr2O7?

<p>Orange (B)</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 (B)</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 (B)</p> Signup and view all the answers

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

<p>Carboxylic acids (C)</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 (B)</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 (C)</p> Signup and view all the answers

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

<p>Purple (B)</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 (D)</p> Signup and view all the answers

What is the characteristic of carboxylic acids in water?

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

What is the pH value of a carboxylic acid solution?

<p>Less than 7 (D)</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 (C)</p> Signup and view all the answers

What type of reaction does carboxylic acid undergo with alkali?

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