Consider the following reactions: I.C2H5−I+NH3⟶C2H5⊕NH3+I⊖ II.C2H5−I+⋅⋅PH3⟶C2H5⊕PH3+I⊖ III.C2H5−I+EtO⊖⟶C2H5−OEt+I⊖ IV.Me−⊕S−Me2+⊖OH⟶Me−OH+Me2S In which of the above reactions does the rate of SN2 reaction increase in solvent polarity?
A
(I)
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B
(II)
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C
(III)
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D
(IV)
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Solution
The correct options are C(I) D(II) If the reactant and/or nucleophile are neutral T.S is stablised, rate of SN2 reaction increases with the increase in polarity of the solvent.