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Fastest SN2 reaction or SN2 reactivity order of given halides

This type of question, asked 2 times: 8 Apr 2024, 21 Jan 2026 S2. All 2 questions below, oldest first.

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  1. Question 1

    8 Apr 2024

    32
    Which among the following compounds will undergo fastest SN2S_{N}2 reaction?

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  2. Question 2

    21 Jan 2026 S2

    34
    The correct order of reactivity of the following benzyl halides towards reaction with KCN is:

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