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Choose the correct decreasing order of reactivity of alkyl halides towards $\mathrm{S}_{\mathrm{N}} 1$ reaction.
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The correct answer is:
Tertiary halide $>$ Secondary halide $>$ Primary halide
The reactivity of alkyl halides towards nucleophilic $\mathrm{S}_{\mathrm{N}} 1$ reaction depends on the stability of the intermediate carbocation formed in the first step.
Thus, reactivity follows the order :$3^{\circ}$ halide $>2^{\circ}$ halide $>1^{\circ}$ halide.
Thus, reactivity follows the order :$3^{\circ}$ halide $>2^{\circ}$ halide $>1^{\circ}$ halide.
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