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What is the correct order of reactivity ...

What is the correct order of reactivity of alcohols in the following reaction ?
`R-OH+HCloverset(ZnCl_(2))rarrR-Cl+H_(2)O`

A

`1^@ gt 2^@ gt 3^@`

B

`1^@ lt 2^@ gt 3^@`

C

`3^@ gt 2^@ gt 1^@`

D

`3^@ gt 1^@ gt 2^@`

Text Solution

Verified by Experts

The correct Answer is:
C
The given reaction is nucleophilic substitution reaction in which `-OH` group is replaced by `-Cl`. Tertiary alcohols, when react with `HCl` in presence of `ZnCl_2`, form tertiary carbocation.
This intermediate 3° carbocation is more stable than 2° carbocation as well as 1° carbocation. Higher the stability of intermediate, higher will be the reactivity of reactant molecule.
So, the order of reactivity of alcohols in the given reaction is 3° > 2° > 1° .
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