Question
Question: Arrange the following anions in decreasing leaving ability in SN<sup>2</sup> reaction - (I) CF<sub...
Arrange the following anions in decreasing leaving ability in SN2 reaction -
(I) CF3CO2Æ (II) CH3SO3Æ
(III) CF3SO3Æ
(IV) p-nitrobenzenesulphonate
A
III > IV > II > I
B
III > I > II > IV
C
IV > III > I > II
D
IV > III > II > I
Answer
III > IV > II > I
Explanation
Solution
The relative rate is :
CF3SO3Æ :- 1.4 × 108,
p-nitrobenzenesulphonate :- 4.4 × 105
CH3SO3– :- 3 × 104, CF3CO2– :- 2.1