The reactivity of $2$ -bromo- $2$ -methylbutane $(I)$ , $1$ -bromopentane $(I I)$ and $2 -$ bromopentane $(I I I)$ towards $S_{N} 2$ displacement is such that:

I > I I > I I I

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I > I I I > I I

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I I > I I I > I

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I I > I > I I I

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Solution

The correct option is B $I I > I I I > I$
The order of the reactivities towards $S N^{2}$ displacements is $I I > I I I > I$ or $1 - b r o m o p e n t a n e (I I) > 2 - b r o m o p e n t a n e (I I I) > 2 - b r o m o - 2 - m e t h y l b u t a n e (I)$
This is because the stability order for carbocation is $3^{o} > 2^{o} > 1^{o}$ .

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The reactivity of 2-bromo-2-methylbutane (I), 1-bromopentane (II) and 2−bromopentane (III) towards SN2 displacement is such that:

The correct option is B II>III>IThe order of the reactivities towards SN2 displacements is II>III>I or 1−bromopentane(II)>2−bromopentane(III)>2−bromo−2−methylbutane(I)This is because the stability order for carbocation is 3o>2o>1o.

The reactivity of $2$ -bromo- $2$ -methylbutane $(I)$ , $1$ -bromopentane $(I I)$ and $2 -$ bromopentane $(I I I)$ towards $S_{N} 2$ displacement is such that: