A detailed chemical diagram illustrates the nucleophilic substitution reaction mechanisms SN2 and SN1 in halogenoalkanes, featuring a primary halogenoalkane on the left undergoing SN2 reaction with a hydroxide ion (OH-) forming a transition state and product, while a tertiary halogenoalkane on the top right undergoes SN1 reaction involving carbocation intermediate and water (H2O) as nucleophile,
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