Question

Arrange the following alkyl halides in ascending order of their reactivity towards $S_{N}1$ reaction.
$C{H}_{3}X,C{H}_3-C{H}_2-X,C{H}_3-\underset{X}{\underset{|}{C}}H-C{H}_3,C{H}_3-\stackrel{C{H}_3}{\stackrel{|}{\underset{C{H}_3}{\underset{|}{C}}}}-X,$ $(X=Same)$

Answer 1

Ascending order of their reactivity towards $S_{N}1$SN1 is:
is:

$3^{0}R-X>2^{0}R-X>1^{0}R-X>C{H}_3-X$

So among the given options the order is,

$4>3>2>1$