Which of the following is least reactive towards $S N^{1}$ ?

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Solution

The correct option is A

Rate of $S N^{1} \propto$ Stability of carbocation

a. $\Rightarrow$ Anti - aromatic

b. $\Rightarrow$ Non-aromatic (no resonance)

c. $\Rightarrow$ Non-aronmatic (resonance)

d. $\Rightarrow$ Aromatic

Stability order:

Aromatic > non -aromatic > anti - aromatic

$∴ d > c > b > a$

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