With which of the following will HBr react th | vedclass

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(A) The reaction of alcohols with $HBr$ proceeds via an $S_N1$ mechanism,which involves the formation of a carbocation intermediate. The rate of react

Vedclass · Accepted Answer

$2$-Methylpropan-$2$-ol

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(A) The reaction of alcohols with $HBr$ proceeds via an $S_N1$ mechanism,which involves the formation of a carbocation intermediate. The rate of reaction depends on the stability of the carbocation formed. $2$-Methylpropan-$2$-ol is a tertiary $(3^{\circ})$ alcohol,which forms a stable tertiary carbocation. Propan-$2$-ol is a secondary $(2^{\circ})$ alcohol,while $2$-Methylpropan-$1$-ol and Propan-$1$-ol are primary $(1^{\circ})$ alcohols. Since the stability order of carbocations is $3^{\circ} > 2^{\circ} > 1^{\circ}$,the tertiary alcohol ($2$-Methylpropan-$2$-ol) will react the fastest.

With which of the following will $HBr$ react the fastest?

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