Question

The increasing order of reactivity towards S_N1 mechanism is:

(I) \[\begin{array}{cc}
\ce{CH3-CH-CH2-CH3}\\
|\phantom{........}\\
\ce{CH3}\phantom{.....}
\end{array}\]

(II) CH₃CH₂CH₂Cl

(III) P–CH₃O–C₆H₄–CH₂Cl

Options

• (III) < (II) < (I)

• (II) < (I) < (III)

• (I) < (III) < (II)

• (II) < (III) < (I)

Answer 1

(II) < (I) < (III)

Explanation:

∵ 1° < 2° < Benzyl carbocation with OCH₃ at p-position is order of stability of carbocation.