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(N/A) $1.$ Reaction rate$S_{N}1$ depends only on the concentration of alkyl halides,whereas $S_{N}2$ depends on the concentration of both alkyl halide

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(N/A) $1.$ Reaction rate$S_{N}1$ depends only on the concentration of alkyl halides,whereas $S_{N}2$ depends on the concentration of both alkyl halides and nucleophiles.$2.$ Order of reaction$S_{N}1$ is a first-order reaction,while $S_{N}2$ is a second-order reaction.$3.$ Nature of nucleophile$S_{N}1$ is favored by weak nucleophiles,whereas $S_{N}2$ requires strong nucleophiles.$4.$ Reactivity of alkyl halides$S_{N}1$ reactivity order is $3^{\circ} > 2^{\circ} > 1^{\circ} > 	ext{Methyl}$,while $S_{N}2$ is $	ext{Methyl} > 1^{\circ} > 2^{\circ} > 3^{\circ}$.$5.$ Intermediate product$S_{N}1$ involves a carbocation intermediate (rearrangement possible),while $S_{N}2$ proceeds through a pentavalent transition state with no intermediate.$6.$ Nature of solvents$S_{N}1$ is favored by polar protic solvents (e.g.,$H_{2}O, CH_{3}OH$),while $S_{N}2$ is favored by polar aprotic solvents (e.g.,$	ext{DMSO}, (CH_{3})_{2}CO$).$7.$ Stereochemistry$S_{N}1$ causes partial racemization,whereas $S_{N}2$ always causes Walden inversion of configuration.

Enlist the main points of difference between $S_{N}1$ and $S_{N}2$ reactions.

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$1.$ Reaction rate	$S_{N}1$ depends only on the concentration of alkyl halides,whereas $S_{N}2$ depends on the concentration of both alkyl halides and nucleophiles.
$2.$ Order of reaction	$S_{N}1$ is a first-order reaction,while $S_{N}2$ is a second-order reaction.
$3.$ Nature of nucleophile	$S_{N}1$ is favored by weak nucleophiles,whereas $S_{N}2$ requires strong nucleophiles.
$4.$ Reactivity of alkyl halides	$S_{N}1$ reactivity order is $3^{\circ} > 2^{\circ} > 1^{\circ} > \text{Methyl}$,while $S_{N}2$ is $\text{Methyl} > 1^{\circ} > 2^{\circ} > 3^{\circ}$.
$5.$ Intermediate product	$S_{N}1$ involves a carbocation intermediate (rearrangement possible),while $S_{N}2$ proceeds through a pentavalent transition state with no intermediate.
$6.$ Nature of solvents	$S_{N}1$ is favored by polar protic solvents (e.g.,$H_{2}O, CH_{3}OH$),while $S_{N}2$ is favored by polar aprotic solvents (e.g.,$\text{DMSO}, (CH_{3})_{2}CO$).
$7.$ Stereochemistry	$S_{N}1$ causes partial racemization,whereas $S_{N}2$ always causes Walden inversion of configuration.