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Organic analysis

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Question 6

Test-tube reactions can be used to identify the functional groups in organic molecules.

You are provided with samples of each of the following four compounds:

  • K: CH2=CH−CH2−COOH\text{CH}_2=\text{CH}-\text{CH}_2-\text{COOH}CH2​=CH−CH2​−COOH
  • L: CH3−CH2−CH2−COOH\text{CH}_3-\text{CH}_2-\text{CH}_2-\text{COOH}CH3​−CH2​−CH2​−COOH
  • M: CH2=CH−CH2−CH2OH\text{CH}_2=\text{CH}-\text{CH}_2-\text{CH}_2\text{OH}CH2​=CH−CH2​−CH2​OH
  • N: CH3−CH2−CH2−CHO\text{CH}_3-\text{CH}_2-\text{CH}_2-\text{CHO}CH3​−CH2​−CH2​−CHO

Describe how you could distinguish between all four compounds using the minimum number of tests on each compound.

You should describe what would be observed in each test.

[6]
Markscheme

Organic analysis Questions

  1. A Level
  2. /Chemistry
  3. /Organic analysis

21 exam-style questions on AQA A Level Chemistry Organic analysis, covering Identification of functional groups by test-tube reactions, Mass spectrometry, and Infrared spectroscopy. Each one has a worked solution and a mark scheme showing where the marks go.

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