Question

The order of reactivities of the following alkyl halides for an $S_{N}2$ reaction is:

• A. $RF>RCl>RBr>RI$
• B. $RF>RBr>RCl>RI$
• C. $RCl>RBr>RF>RI$
• D. $RI>RBr>RCl>RF$

Answer 1

Answer: (D)

$RI>RBr>RCl>RF$

More good the leaving group more will be reactivity of alkyl halide in $S{N}_2$ since order of leaving group is $I>Br>Cl>F$

So,order of reactivity of alkyl halide in $S{n}_2$ reaction is $RI>RBr>RCl>RF$