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Arrange the following in increasing order of reactivity in an S_N2 reaction with KI in acetone solvent

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II < III < I < IV

I < IV < III < II

IV < I < III < II

III < II < I < IV

answer is B.

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Detailed Solution

In halogen-exchange (Finkelstein reaction), reactivity is determined by solubility of NaX formed in acetone. Lower the solubility of NaX in acetone, easier the reaction. NaCl is less soluble than NaBr in acetone.

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