SN reaction is givenby these compounds, whichhave a nuclophilic group and a good leaving EWG. It should be stable after leaving with bonding pair of overline(e)'s and it should have high polarisability. Nucliphilic aliphatic substituion reaction is mainly of two types SN^(-1) and SN^(2). SN^(-1) mechanism is a two step process. Reaction velocity of SN^(-1) depends only on the concentration of the subtrate. It proceeds via the formation of carbocation, optically active substrate gives (o+) and (o-) froms of the product. In most of the cases, the product usually consists of 5-20% inverted and (95-80%) racemised species. The more stable is the carbocation, the greater is the propotion of racemission. In solvolysis reaction, the more nucleophillic is the solvent, the greater is the proportion of inversion. Fugacity power of which group will be maximum?

SN reaction is givenby these compounds, whichhave a nuclophilic group

1.	SN reaction is givenby these compounds, whichhave a nuclophilic group and a good leaving EWG. It should be stable after leaving with bonding pair of overline(e)'s and it should have high polarisability. Nucliphilic aliphatic substituion reaction is mainly of two types SN^(-1) and SN^(2). SN^(-1) mechanism is a two step process. Reaction velocity of SN^(-1) depends only on the concentration of the subtrate. It proceeds via the formation of carbocation, optically active substrate gives (o+) and (o-) froms of the product. In most of the cases, the product usually consists of 5-20% inverted and (95-80%) racemised species. The more stable is the carbocation, the greater is the propotion of racemission. In solvolysis reaction, the more nucleophillic is the solvent, the greater is the proportion of inversion. Fugacity power of which group will be maximum?
Answer» `CH_(3) - O - underset(O)underset(\|\|)overset(O)overset(\|\|)(S)-C_(2)H_(5)` `CH_(3) - O - underset(O)underset(\|\|)overset(O)overset(\|\|)(S)-CH_(3)` `CH_(3) - O - overset(O)overset(\|\|)(C)-CH_(3)` SOLUTION :Stronger the acid or weaker the base, better is the leaving GROUP. In `(C)` due to `-I` effect of THREE `F` atoms, it makes stronger acid. Therfore, the order of leaving group: `(c) gt (B) gt (a) gt (d)`.