Chemistry - Halogen Derivative Question with Solution | TestHub
ChemistryHalogen DerivativeNUCLEOPHILIC SUBSTITUTION REACTIONS (SN1 AND SN2), SN(NEIGHBOURING GROUP PARTICIPATION), SNIMedium2 minQB
ChemistryMediumsingle choice
An unknown alcohol is treated with the "Lucas reagent" to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and mechanism used is :
Options:
Answer:
D
Solution:
Lucas reagent (conc. HCl + ZnCl₂) distinguishes 1°, 2°, 3° alcohols.
Reaction proceeds via carbocation formation (SN1 mechanism).
Tertiary alcohol forms most stable carbocation → reacts fastest.
Primary alcohol reacts very slowly (SN2), secondary moderate.
So fastest reaction = tertiary alcohol with SN1.
Stream:JEESubject:ChemistryTopic:Halogen DerivativeSubtopic:NUCLEOPHILIC SUBSTITUTION REACTIONS (SN1 AND SN2), SN(NEIGHBOURING GROUP PARTICIPATION), SNI
⏱ 2mℹ️ Source: QB
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