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Explain S(N) - 1 reaction mechanism....

Explain `S_(N) - 1` reaction mechanism.

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The reaction between tert-butyl bromide and hydroxide ion gives tert-butyl alcohol. The rate of reaction depends only on the concentration of tert butyl bromide. Hence it is a nucleophilic first order substitution reaction.
`{:(" "CH_(3)" "CH_(3)),(" |"" |"),(H_(3)C-C-Br+OH^(-) rarr H_(3)C - C-OH+Br^(-)),(" |"" |"),(" "CH_(3)" "CH_(3)):}`
Mechanism :
Step 1 : Polarised C - br undergoes cleavage to produce planar carbocation.

Step 2 : The carbocation is then attacked by nucleophile `(OH^(-))` on either side to form tert-butyl alcohol.
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