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Elimination reactions (especially \beta-elimination) are as common as the nucleophilic substitution reaction in the case of alkyl halides. Specify the reagents used in both cases.

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Alkyl halides respond to nucleophilic substitution as well as elimination (\beta-elimination) reactions.

Although, by setting the reaction condition and making the right choice of reagent, a particular product can be obtained,. Normally, the elimination reaction suits strong and larger bases along with high temperatures. Whereas substitution reactions are suitable for weaker and smaller bases at lower temperatures,

Ex:

CH_{3}CH_{2}Br\xrightarrow[alc. KOH]{473-573K}CH_{2}=CH_{2} (Elimination)

CH_{3}CH_{2}Br\xrightarrow[aq. KOH]{373K}CH_{3}-CH_{2}OH (Substitution)

Nucleophilic Substitution: Reagents used are nucleophiles like ^{-}{O}H, NH_{3}, ^{-}{C}\equiv N, O=N-O, ^{-}OR, etc. at a lower temperature undergo substitution reactions.

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