Question

In the given pair of reacrtion in which pair the second raction is more reactive then first toward ` S_(N^(2))` reaction?
A. `C H_(3)-CH_(2)-Cl+CH_(3)-CH_(2)-O^(-)toEt-O-Et (or)
`CH_(2)-CH_(2)-Cl+Ch_(3)-CH_(2)OHto Et-O-Et`
B. `CH_(3)-CH_(2)-Cl+EtO^(-)toEt-O-Et`" "(or)
`CH_(3)-CH_(3)-CH_(2)-Cl+EtS^(-)to CH_(3)-CH_(2)-S-Et`
C. `underset((1m))Et-Cl+CH_(3)O^(-)to Et-O-CH_(3) (or)`
` underset(2m)Et -Cl+CH_(3)PtoEt-O-CH_(3)`
D. `Et-Br+Ph_(3)P to Et -overset(o+)PPh_(3)(or)`
`Et-Br+Ph_(3)NtoE + -overset(o+)NPh_(3)`

Answer 1

Correct Answer - b
`EtS^(o-) ` Is more nuscleophiklic the n `EtO^(0-)`
(A) `CH_(3)-CH_(2)-O^(-)gtCH_(3)-CH_(2)-OH"changed "Nu^(-)` better than neutral .

more stable T.S because fo more bionding due to large size .
(C ) Rate of `S_(N^(2)) alpha ["substate"][NU^(-)]`
It is equal for both 1 nan d2 .
(d)` ph_(3) Pgt ph_(3) n`
`Et-overset(0+)P ph_(3) gt Et - overset(0+) N ph_(3) ` more stable because more change dispersion on larger atom.