Consider the following reactions: I. C_(2)H_(5) - I + NH_(3) rarr C_(2) H_(5) N^(o+)H_(3) + I^(o-) II. C_(2)H_(5) - I + ddot(P)H_(3) rarr C_(2)H_(5) P^(o+)H_(5) + I^(o-) III. C_(2)H_(5) - I + EtO^(o-) rarr C_(2) H_(5) - Oet + I^(o-) IV. Me - overset(o+)(S) - Me_(2) + O^(o-)H rarr Me-OH + Me_(2)S In which of the above reactionsdoes not the rate of SN^(2) reactions increasesin solvent polarity?

Consider the following reactions: I. C_(2)H_(5) - I + NH_(3) rarr C_(

1.	Consider the following reactions: I. C_(2)H_(5) - I + NH_(3) rarr C_(2) H_(5) N^(o+)H_(3) + I^(o-) II. C_(2)H_(5) - I + ddot(P)H_(3) rarr C_(2)H_(5) P^(o+)H_(5) + I^(o-) III. C_(2)H_(5) - I + EtO^(o-) rarr C_(2) H_(5) - Oet + I^(o-) IV. Me - overset(o+)(S) - Me_(2) + O^(o-)H rarr Me-OH + Me_(2)S In which of the above reactionsdoes not the rate of SN^(2) reactions increasesin solvent polarity?
Answer» `(I)` `(II)` `(III)` `(IV)` Solution :If the recatant and/or nucleophilic are changed, INCREASING the polarity of the SOLVENT stablises any charged ground state speicesand decreases the RATE of `SN^(2)` reaction with an increase with the increases in polaityof the solvent.