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Consider the following S(N^2)j reactions...

Consider the following `S_(N^2)`j reactions
I. `RX+Y^(-)toR-Y+X^(-)`
II. `RX+Y^(-)toR-Y^(+)+X^(-)`
III. `RX^(+)+Y^(-)toR-Y+X`
IV. `RX^(+)+YtoR-Y^(+)+X`
In which reactions there is large increase and large decrease in rate of reaction respectively with increase in polarity of the solvent.

A

II and III

B

II and IV

C

I and IV

D

IV and I

Text Solution

Verified by Experts

The correct Answer is:
A
For II. Transition state is more stabilised than reactant.
For III : Reactants are more stabilised than transition state. Hence, rate of reaction is affected accordingly.
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