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Carboxylic acids and derivatives (A-level only)

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Question 1

This question is about amino acids and peptide (amide) links.

1.

Draw the structure of the zwitterion formed by alanine.

[1]
2.

Draw the structure of valine at low pH\text{pH}pH.

[1]
3.

Draw the structures of both dipeptides formed when alanine reacts with valine. In each structure, show all the atoms and bonds in the amide link.

[3]
4.

An amide link is also formed when an acyl chloride reacts with a primary amine. Name and outline a mechanism for the reaction between ethanoyl chloride, CH3COCl\text{CH}_3\text{COCl}CH3​COCl, and propan-1-amine, CH3CH2CH2NH2\text{CH}_3\text{CH}_2\text{CH}_2\text{NH}_2CH3​CH2​CH2​NH2​. Give the IUPAC name of the organic product.

[7]
Markscheme

Carboxylic acids and derivatives (A-level only) Questions

  1. A Level
  2. /Chemistry
  3. /Carboxylic acids and derivatives (A-level only)

22 exam-style questions on AQA A Level Chemistry Carboxylic acids and derivatives (A-level only), covering Carboxylic acids and esters (A-level only) and Acylation (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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