The order of reactivities of the following alkyl halides for a SN2 reaction is

Question

The order of reactivities of the following alkyl halides for a SN2 reaction is (A)  RF>RCl>RBr>RI  (B)  RF>RBr>RCl>RI  (C)  RCl>RBr>RF>RI  (D)  RI>RBr>RCl>RF

Tardigrade Admin · Accepted Answer

The reactivity order of alkyl halide is R-I>R-Br>R-Cl>R-F This order is due to the bond dissociation enthalpy i.e. the energy required to cleave the C-X bond. Lesser the bond dissociation energy, more will be the reactivity of the haloalkanes.

Q. The order of reactivities of the following alkyl halides for a $S_{N} 2$ reaction is

$RF > RCl > RB r > R I$

$RF > RB r > RCl > R I$

$RCl > RB r > RF > R I$

$R I > RB r > RCl > RF$

The reactivity order of alkyl halide is $R - I > R - B r > R - Cl > R - F$ This order is due to the bond dissociation enthalpy i.e. the energy required to cleave the $C - X$ bond. Lesser the bond dissociation energy, more will be the reactivity of the haloalkanes.

Q. The order of reactivities of the following alkyl halides for a SN​2 reaction is

RF>RCl>RBr>RI

RF>RBr>RCl>RI

RCl>RBr>RF>RI

RI>RBr>RCl>RF