Substitution - a reaction in which one atom or group in a molecule is replaced by another, usually there are 2 starting molecules and 2 products.
Addition - 2 molecules add together to give a single product
Elimination - a reaction in which a (small) molecule is removed from a larger one, where one starting material gives rise to 2 products
Nucleophile - an atom, molecule or ion which seeks out centres beaing a positive charge, it will always have an electron deficient site
Electrophile - an atom or molecule which seeks out centres which are electron rich (often in unsaturated systems) and is able to accept an electron pair in order to form a dative covalent bond at the site of attack.
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