From amongst the following alcohols the one that would react fastest with conc .HCl and anhydrous ZnCl2, is
The reagent, conc.HCl and anhydrous ZnCl2 is Lucas reagent, which is used to distinguish between 1°, 2° and 3° alcohols.
3° alcohol + Lucas reagent → Immediate turbidity.
2° alcohol + Lucas reagent → Turbidity after 5 mins.
1° alcohol + Lucas reagent → No reaction.
Thus, the required alcohol is 2-methylpropan-2- ol, i.e.
As we learnt in
Test of alcohol Lucas test -
Tertiary alcohol reacts fastest with Lucas reagent.
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