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Learning objective

Use Tollens' and Fehling's reagents to distinguish aldehydes from ketones.

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Topic

Aldehydes and ketones (A-level only)

Subtopic

Aldehydes and ketones (A-level only)

Aqa A Level ChemistryOrganic chemistry

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Quick explanation

Use Tollens' and Fehling's reagents to distinguish aldehydes from ketones

  • This point belongs to Aldehydes and ketones (A-level only), especially Aldehydes and ketones (A-level only).
  • You need to be able to use Tollens' and Fehling's reagents to distinguish aldehydes from ketones.
  • The key ideas to know are ketone, aldehyde, and Tollens.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

ketonealdehydeTollensFehling

Why it matters

This objective helps connect Aldehydes and ketones (A-level only) to exam-style questions, flashcards, and revision notes for Aldehydes and ketones (A-level only).

Quick student answer

Which of the following reagents can be used to distinguish between an aldehyde and a ketone?

Direct answer

Tollens' reagent can be used to distinguish between aldehydes and ketones.

Key terms

  • Oxidation: The process of losing electrons or increasing oxidation state, often involving the addition of oxygen or removal of hydrogen.
  • Reduction: The process of gaining electrons or decreasing oxidation state, often involving the addition of hydrogen or removal of oxygen.

Common trap

Confusing aldehydes with ketones: Remember that only aldehydes can reduce Tollens' reagent; ketones do not react.

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