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Learning objective

Required practical: tests for alcohol, aldehyde, alkene and carboxylic acid.

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Topic

Organic analysis

Subtopic

Test-tube reactions and mass spectrometry

Aqa A Level ChemistryOrganic chemistry

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Quick explanation

Required practical: tests for alcohol, aldehyde, alkene and carboxylic acid

  • This point belongs to Organic analysis, especially Test-tube reactions and mass spectrometry.
  • You need to be able to required practical: tests for alcohol, aldehyde, alkene and carboxylic acid.
  • The key ideas to know are alcohol, tests, and aldehyde.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

alcoholtestsaldehyderequiredpractical

Why it matters

This objective helps connect Test-tube reactions and mass spectrometry to exam-style questions, flashcards, and revision notes for Organic analysis.

Quick student answer

Which reagent is used to test for the presence of an alcohol?

Direct answer

Acidified potassium dichromate is used to oxidize primary and secondary alcohols, resulting in a color change from orange to green.

Key terms

  • Tollens' reagent: A reagent used to test for aldehydes, consisting of silver nitrate in ammonia, which forms a silver mirror upon reaction with aldehydes.
  • Decolorization: The process in which a colored solution loses its color, often used to describe the reaction of alkenes with bromine water.

Common trap

Confusing alcohols with carboxylic acids: Remember that alcohols do not produce effervescence with sodium bicarbonate, while carboxylic acids do.

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