In which of the following reactions, SN^2 rate increases on changing the solvent from (95 % acetone + 5 % H_2 O) to (80 % acetone + 20 % H_2O) ?

In which of the following reactions, SN^2 rate increases on changing t

1.	In which of the following reactions, SN^2 rate increases on changing the solvent from (95 % acetone + 5 % H_2 O) to (80 % acetone + 20 % H_2O) ?
Answer» `Me_2 - OVERSET (oplus) P- Me + NH_3 rarr Me overset (oplus) N H_3 + Me_2 P`<BR>`MEI + PH_3 rarr Me overset (oplus) P H_3 + I^(Ө)` `MeBr + overset (Ө) O H rarr MEOH + Br^(Ө)` `Me_2 - overset (oplus) S - Me + overset (Ө)OH rarr MeOH + Me_2 S` Answer :B