Choose the correct decreasing order of reactivity of alkyl halides towards $S_{N} 1$ reaction

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Tertiary halide > Secondary halide > Primary halide

Primary halide > Secondary halide > Tertiary halide

Secondary halide > Tertiary halide > Primary halide

Tertiary halide > Primary halide > Secondary halide

answer is C.

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Detailed Solution

The reactivity of alkyl halides towards nucleophilic $S_{N} 1$ reaction depends on the stability of the intermediate carbocation formed in the first step.
Thus, reactivity follows the order:-
$3^{0}$ halide $> 2^{0}$ halide $> 1^{0}$ halide.

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