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Write and understand the general formulae for compounds within the same homologous series, specifically: (a) alkanes, CnH2n+2 (b) alkenes, CnH2n (c) alcohols, CnH2n+1OH (d) carboxylic acids, CnH2n+1COOH.

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Cambridge IGCSE ChemistryOrganic chemistryCore content

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Write and understand the general formulae for compounds within the same homologous series, specifically: (a) alkanes, CnH2n+2 (b) alkenes, CnH2n (c) alcohols, CnH2n+1OH (d) carboxylic acids, CnH2n+1COOH

  • This point belongs to Formulae, functional groups and terminology, especially Formulae, functional groups and terminology outcomes.
  • You need to be able to write and understand the general formulae for compounds within the same homologous series, specifically: (a) alkanes, CnH2n+2 (b) alkenes, CnH2n (c) alcohols, CnH2n+1OH (d) carboxylic acids, CnH2n+1COOH.
  • The key ideas to know are State and Identify.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

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StateIdentify

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Paper 3 structured question: Formulae, functional groups and terminology

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Description

General Formulae of Organic Compounds

The general formulae for various homologous series are as follows: - Alkanes: CnH2n+2 - Alkenes: CnH2n - Alcohols: CnH2n+1OH - Carboxylic Acids: CnH2n+1COOH

  1. a

    State the general formula for alkenes.

    Aim for approximately 1 distinct marking point.

    [1]
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