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The alcohol that reacts fastest with Luc...

The alcohol that reacts fastest with Lucas reagent and its mechanism are respectively

A

Tertiary alcohol by `S_(N)1`

B

Secondary alcohol by `S_(N)2`

C

tertiary alcohol by `S_(N)2`

D

Secondary alchol by `S_(N)1`

Text Solution

Verified by Experts

The correct Answer is:
A
Lucas reagent reacts with, alcohol via S^l mechanism via formation of carbocation intermediate.
`R - OH + HCl overset(ZnCl_(2)) to R^(+) overset(Cl^(-)) to R - Cl`
The reaction proceeds through `S_N1` mechanism with tertiary alcohol and the rate of reaction is directly proportional to stability of carbocation formation. As tertiary carbocation formed by tertiary alcohol is highly stable, hence the reaction is the fastest.
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Knowledge Check

  • The alcohol that reacts fastest with Lucas reagent and its mechanism are respctively

    A
    Teritary alcohol by `S_(N)1`
    B
    Secondary alcohol by `S_(N)2`
    C
    Teritary alcohol by `S_(N)2`
    D
    Secondary alcohol by `S_(N)1`

  • The compound which reacts fastest with Lucas reagent at room temperature is:

    A
    Butan-2-oI
    B
    Butan-l-ol
    C
    2-MethyIpropan-l-oI
    D
    2-Methylpropan-2-ol

  • The compound which reacts fastest with Lucas reagent at room temperature is :

    A
    Butan-2-ol
    B
    Butan-1-ol
    C
    2-Methyl propan-1-ol
    D
    2-Methyl propan-2-ol

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    Compound 'A' of molecular formula C_(4) H_(10) O on treatment with Lucas reagent at room temperature gives compound 'B'. When compound 'B' is heated with alcoholic KOH, it gives isobutene. Compound 'A' and 'B' are respectively

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