The order of reactivity of various alkyl halides towards $S_{N} 1$ reaction is:

3^{o} > 2^{o} > 1^{o}

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1^{o} > 2^{o} > 3^{o}

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3^{o} = 2^{o} = 1^{o}

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1^{o} > 3^{o} > 2^{o}

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Solution

The correct option is D $3^{o} > 2^{o} > 1^{o}$
$S_{N} 1$ mechanism proceeds through carbocation formation, as stability of carbocation increases, reaction favors $S_{N} 1$ mechanism.

$3^{o}$ carbocations are more stable than others or stability order of carbocations is $3^{o} > 2^{o} > 1^{o},$ so, order of alkyl halides towards $S_{N} 1$ reaction is $3^{o} > 2^{o} > 1^{o}$ .

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