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(B) The rate of $SN1$ reaction depends on the stability of the carbocation formed after the departure of the leaving group. $1$. In compound $A$,$Br_{

Vedclass · Accepted Answer

$A-Br_{(a)}$; $B-I_{(a)}$; $C-Br_{(b)}$; $D-Br_{(a)}$

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(B) The rate of $SN1$ reaction depends on the stability of the carbocation formed after the departure of the leaving group. $1$. In compound $A$,$Br_{(a)}$ forms a benzylic carbocation,which is highly stabilized by resonance. $2$. In compound $B$,$I_{(a)}$ forms an allylic carbocation,which is also resonance stabilized but less than the benzylic one. $3$. In compound $C$,$Br_{(a)}$ forms a tertiary carbocation. $4$. In compound $D$,$Br_{(a)}$ forms a tertiary carbocation. Comparing the stability,the benzylic carbocation formed by $Br_{(a)}$ in compound $A$ is the most stable. Therefore,$A-Br_{(a)}$ is the most reactive towards $SN1$ reaction.

Choose the halogen which is most reactive towards $SN1$ reaction in the given compounds $(A, B, C, D)$:

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