Question

In S_N1 reactions, the correct order of reactivity for the following compounds:

CH₃Cl, CH₃CH₂Cl, (CH₃)₂CHCl and (CH₃)₃CCl is ______.

Options

• (CH₃)₃CCl > (CH₃)₂CHCl > CH₃Cl > CH₃CH₂Cl

• (CH₃)₃CCl > (CH₃)₂CHCl > CH₃CH₂Cl > CH₃Cl

• CH₃Cl > (CH₃)₂CHCl > CH₃CH₂Cl > (CH₃)₃CCl

• CH₃Cl > CH₃CH₂Cl > (CH₃)₂CHCl > (CH₃)₃CCl

Answer 1

In S_N1 reactions, the correct order of reactivity for the following compounds:

CH₃Cl, CH₃CH₂Cl, (CH₃)₂CHCl and (CH₃)₃CCl is (CH₃)₃CCl > (CH₃)₂CHCl > CH₃CH₂Cl > CH₃Cl.

Explanation:

The order of reaction in S_N1 reaction mainly depends on the stability of carbocation, the order of reactivity followed:

\[\begin{array}{cc}
\phantom{.}\ce{CH3}\phantom{............}\ce{Cl}\phantom{.................................}\\
\phantom{}|\phantom{................}|\phantom{.................................}\\
\ce{CH3 - C - Cl > \underset{2° Carbon}{CH3 - CH - CH3} > \underset{1° Carbon}{CH3 - CH2 - Cl} > \underset{1° Carbon}{CH3 - Cl}}\\
|\phantom{.................................................}\\
\ce{\underset{3° Carbon}{CH3}}\phantom{..............................................}
\end{array}\]