Q.

Among the given hydroxyl compound how many will give precipitate immediately when treated with concentrated hydrochloric acid and anhydrous zinc chloride. 3-methyl-2-butanol; 3-methyl-1-butanol; 1-butanol; 2-methyl-2-butanol; 2, 3-dimethyl-2-butanol, 2, 3-dimethyl- 1-butanol

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answer is 2.

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Detailed Solution

Structure of given alcohols2, 3-dimethyl -2-butanol and 2-methyl-2-butanol being tertiary alcohol gives precipitate immediately with conc. HCl and anhydrous ZnCl2. The simple reason is Stability of carbocation.
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Among the given hydroxyl compound how many will give precipitate immediately when treated with concentrated hydrochloric acid and anhydrous zinc chloride. 3-methyl-2-butanol; 3-methyl-1-butanol; 1-butanol; 2-methyl-2-butanol; 2, 3-dimethyl-2-butanol, 2, 3-dimethyl- 1-butanol