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Anhydrous ZnCl(2) is required when HCl(g...

Anhydrous `ZnCl_(2)` is required when `HCl(g)` is passed through propan-2-ol but not when it is passed through 2-methylpropan-2-ol. Explain.

Text Solution

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In these reactions, OH group in `C-OH` bond is replaced by Cl atom to form chloroalkane. A tertiary alcohol is more reactive than secondary alcohol. The dehydrating reagent such as anhydrous `ZnCl_2` is needed to absorb molecules of `H_(2)O` in case of secondary alcohol so that the reaction may proceed in the forward direction. Since tertiary alcohol is already highly reactive, no dehydrating agent is needed in this case.

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