The order of reactivity of halides towards $S_{N} 1$ mechanism is:

b e n z y l > a l l y l > 1^{o} 2^{o} > 3^{o} > M e

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M e > 1^{o} > 2^{o} > 3^{o} > a l l y l > b e n z y l

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3^{o} > 2^{o} > 1^{o} > M e > a l l y l > b e n z y l

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b e n z y l > a l l y l > 3^{o} > 2^{o} > 1^{o} > M e

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Solution

The correct option is D $b e n z y l > a l l y l > 3^{o} > 2^{o} > 1^{o} > M e$
The order of reactivity of $S N^{1}$ reactions depends on the stability of carbocation intermediate formed during nucleophilic substitution reaction.So pi bonds and bulky alkyl groups increases the stability of carbocations.
So the correct order of stability is $B e n z y l > A l l y l > 3^{0} > 2^{0} > 1^{0} > m e t h y l$ .
Hence option D is correct.

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