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(I) Mel+PH(3)overset(60% "acetone")overs...

`(I) Mel+PH_(3)overset(60% "acetone")overset(+40%H_(2)O)toMeoverset(oplus)(P)H_(3)+I^(Theta)`
`(II) Mel+PH_(3)overset(H_(2)O)toMeoverset(oplus)(P)H_(3)+I^(Theta)`
Increase in solvent polarity stablilises the `T.S`., lowers `E_(act)`, and increases the rate.

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