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- Help me answer: From amongst the following alcohols the one that would react fastest with conc .HCl and anhydrous ZnCl2, is
- #Chemistry
- #Engineering
- #Organic Compounds containing Oxygen
- #Joint Entrance Examination Main
- #Organic Compounds containing Halogens
From amongst the following alcohols the one that would react fastest with conc .HCl and anhydrous ZnCl2, is
- Option 1)
1-Butanol
- Option 2)
2-Butanol
- Option 3)
2-Methylpropan-2-ol
- Option 4)
2-Methylpropanol
Answers (3)
As we learnt in
Test of alcohol Lucas test -
- wherein
Tertiary alcohol reacts fastest with Lucas reagent.
Option 1)
1-Butanol
This option is incorrect
Option 2)
2-Butanol
This option is incorrect
Option 3)
2-Methylpropan-2-ol
This option is correct
Option 4)
2-Methylpropanol
This option is incorrect
JEE Main high-scoring chapters and topics
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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.
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