= Organic reaction
An <organic reaction> transforms <organic compounds> by changing their bonds, charge, or stereochemistry. Useful families include <substitution reactions>, <addition reactions>, <elimination reactions>, and rearrangements.
A <reaction mechanism> follows electron movement and intermediates rather than only comparing starting and final formulas. For instance, replacing a leaving group by a <nucleophile> can occur by a concerted pathway or through a carbocation intermediate; the two pathways predict different rate laws and stereochemical outcomes. Reaction classes organize transformations, while mechanisms explain how particular conditions produce them.
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