1.

The hydroxyl compound that gives a precipitate immediately when treated with concentrated HCl and anhydrous ZnCl_(2) is :

Answer»

3-methyl-2-butanol
3-methyl-1-butanol
1-butanol
2-methyl-2-butanol

Solution :`underset(2-"methyl-2-butanol")(Ch_(3)-CH_(2)-underset(OH)underset(|)OVERSET(CH_(3))overset(|)C-CH+HCl) overset("ANHYD." ZnCl_(2))to CH_(3)-CH_(2)-underset(Cl)underset(|)overset(CH_(3))overset(|)C-CH_(3)`
Mechanism of this reaction involves the formation of CARBOCATION and the `3^(@)` carbocation is most stable. In the above reaction `3^(@)` carbocationis formed.Hence, when hydrozyl compound is treated with conc. HCl, the precipitate of 2-chloro-2-methylbutane is formed IMMEDIATELY.


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