1.

Which of the following alcohol is most reactive with HCl in presence of anhydrous Zinc chloride at room temperature ?

Answer»

`CH_(3)-CH_(2)-CH_(2)-OH`
`(CH_(3))_(3)-C-OH`
`(CH_(3))_(3)-C-CH_(2)OH`
`(CH_(3))_(2)CH-OH`

Solution :The REACTION with HCl in presence of anhydrous `ZnCl_(2), SN^(1)`, substitution. This reaction is fastest in `3^(@)`-alcohols.
`underset(3^(@)-"alcohol")((CH_(3))_(3)C-OH) +HCl underset(ZnCl_(2))OVERSET("Anhydrous")to underset(3^(@)-"butyl chloride")((CH_(3))_(3)C-Cl+H_(2)O)`
`3^(@)`- alcohols `gt 2^(@)` - alcohols `gt 1^(@)` - alcohols `larr` Rate of `SN^(1)` REACTIONS `larr`


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