1.

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.

Answer»

II and III
II and IV
I and IV
IV and I

Solution :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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