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halogenoalkanes nucleophilic sub
A LevelChemistry~5 min read
Overview
This lesson introduces halogenoalkanes, a class of organic compounds containing a halogen atom bonded to an sp3 hybridised carbon. We will explore their structure, nomenclature, and the crucial nucleophilic substitution reactions they undergo, understanding the mechanisms involved.
Introduction to Halogenoalkanes
Halogenoalkanes, also known as haloalkanes or alkyl halides, are organic compounds where one or more hydrogen atoms in an alkane have been replaced by halogen atoms (fluorine, chlorine, bromine, or iodine). Their general formula can be represented as R-X, where R is an alkyl group and X is a halogen...
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Key Concepts
- Halogenoalkane: An organic compound containing at least one halogen atom (F, Cl, Br, I) covalently bonded to an sp3 hybridised carbon atom.
- Nucleophile: An electron-rich species (often with a lone pair or negative charge) that is attracted to and attacks an electron-deficient centre.
- Electrophile: An electron-deficient species that is attracted to and accepts a pair of electrons from a nucleophile.
- Nucleophilic Substitution: A reaction where a nucleophile replaces another group (the leaving group) on a carbon atom.
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Exam Tips
- →Always draw full displayed formulae for mechanisms, showing curly arrows correctly from electron-rich to electron-deficient centres, and indicating charges and lone pairs.
- →Clearly distinguish between SN1 and SN2 mechanisms based on the structure of the halogenoalkane (primary vs. tertiary) and solvent type. Remember secondary can be either.
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