Haloalkanes and Haloarenes notes
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Haloalkanes and Haloarenes: One-Page Formula Sheet
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Last updated: 26 October 2026
Formula sheet
Haloalkanes and Haloarenes formulas
Haloalkanes and Haloarenes — formula sheet
Formulas
- SN2 reactivity: CH₃X > 1° > 2° > 3°
- SN1 reactivity: 3° > 2° > 1°
- Saytzeff: more substituted alkene is the major product
- Leaving group ability: I⁻ > Br⁻ > Cl⁻ > F⁻
Key ideas
- SN2: one step, inversion, favoured by 1° substrates
- SN1: carbocation, racemisation, favoured by 3° substrates
- Haloarenes resist nucleophilic substitution
- Strong bases at high temperature favour elimination
Traps to avoid
- Choosing SN2 for tertiary halides
- Ignoring stereochemistry
- Forgetting rearrangement in SN1
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