取代反應（英文：substitution reaction）係有機化學入面一類化學反應，將化合物嘅官能基取代咗做另一個。取代反應可以再分做親核取代反應、親電取代反應同自由基取代反應。
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 | 呢篇文 需要熟悉呢方面嘅人幫手寫。 |
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