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H3 Chemistry 9813 · Topic hub

H3 Further Reaction Mechanisms (9813)

H3 Chemistry 9813 Hammond, SN1, SN2, E1 and E2 mechanism lessons and practice for all 14 official further-mechanism leaves.

  • H3 Chemistry 9813
  • 14 lessons
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Before you begin

Follow the lesson route in order when this topic is new. During revision, start with the topic check and return to the exact lesson it identifies.

How the ideas connect

  1. Energy profile
  2. Substitution pathway
  3. Elimination and competition

Learn in order

Lesson route

01

3.1 Hammond postulate

  1. 013.1 a: Apply the Hammond postulate to reaction mechanismsApply the Hammond postulate to reaction mechanisms.
02

3.2 Nucleophilic substitution

  1. 023.2 a(i): Explain nucleophile effects on substitution rateExplain nucleophile effects on substitution rate.
  2. 033.2 a(ii): Explain leaving-group effects on substitution rateExplain leaving-group effects on substitution rate.
  3. 043.2 a(iii): Explain substituent effects on substitution rateExplain substituent effects on substitution rate.
  4. 053.2 b(i): Compare SN1 and SN2 profiles, rate laws and steady-state reasoningCompare SN1 and SN2 profiles, rate laws and steady-state reasoning.
  5. 063.2 b(ii): Compare SN1 and SN2 stereochemistry and ion-pair effectsCompare SN1 and SN2 stereochemistry and ion-pair effects.
  6. 073.2 b(iii): Apply substituent effects to SN1 and SN2Apply substituent effects to SN1 and SN2.
  7. 083.2 c: Evaluate competition between SN1 and SN2Evaluate competition between SN1 and SN2.
03

3.3 Elimination and competition

  1. 093.3 a(i): Apply syn/anti elimination and stereoselectivityApply syn/anti elimination and stereoselectivity.
  2. 103.3 a(ii): Apply Zaitsev/Hofmann regioselectivityApply Zaitsev/Hofmann regioselectivity.
  3. 113.3 b(i): Compare E1 and E2 profiles and rate lawsCompare E1 and E2 profiles and rate laws.
  4. 123.3 b(ii): Compare E1 and E2 regioselectivityCompare E1 and E2 regioselectivity.
  5. 133.3 c(i): Apply substrate effects in E2/SN2 competitionApply substrate effects in E2/SN2 competition.
  6. 143.3 c(ii): Apply base effects in E2/SN2 competitionApply base effects in E2/SN2 competition.

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Practice and repair

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Key ideas and reference

Use this concise H3 Further Reaction Mechanisms (9813) checklist for orientation. Open a linked lesson for definitions, equations, methods and worked examples.

  • Apply the Hammond postulate to reaction mechanisms.
  • Explain nucleophile effects on substitution rate.
  • Apply syn/anti elimination and stereoselectivity.
  • Apply base effects in E2/SN2 competition.
Course coverage and review details

H3 Further Reaction Mechanisms (9813) is presented within H3 Chemistry 9813.

Qualification-specific practice evidence remains separate and is never inferred from a page visit.

Reviewed 2026-08-02

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