(i) $C H_{2} - B r + K O H \to C H_{3} O H + K B r$
Write types of nucelophillic substitution reaction in the above reaction (i) and (ii)?
(b) Write two differences between mechanism of reaction (i) and (ii)?

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Solution

The conversion of methyl bromide to methanol is through $S N^{2}$ mechanism. The conversion of tertiary butyl bromide to tertiary butanol is through $S N^{1}$ mechanism. Tertiary butyl bromide is a tertiary alkyl halide. Tertiary alkyl halides undergo $S N^{1}$ substitution. Methyl halides and primary alkyl halides undergo $S N^{2}$ substitution.
$S N^{1}$ mechanism $S N^{2}$ mechanism
It involves two steps.
It involves only one step.
It involves racemisation. It involves inversion of configuration.

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$S N^{1}$ mechanism	$S N^{2}$ mechanism
It involves two steps.	It involves only one step.
It involves racemisation.	It involves inversion of configuration.