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Reactivity trends of substrates under both sn2 and SN1 reactions (primary, secondary, tertiary)

Reactivity trends of substrates under both sn2 and SN1 reactions (primary, secondary, tertiary)
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Answer #1

Reactivity trends of substrates under SN1 reactions: tertiary > secondary > primary

Explanation: SN1 mechanism invovles formation of a carbocation as an intermediate. Tertiary carbocation is more stable than secondary carbocation and primary carbocation. so tertiary alkyl halides are more reactive in SN1 conditions.

Reactivity trends of substrates under SN2 reactions: primary > secondary > tertiary

Explanation: SN2 mechanis invovles a back side attack of nucleophile on carbon atom bearing halide ion. sterically less hindered alkyl halides or primary alkyl halides are more reactive under SN2 conditions.

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