JEE MAIN - Chemistry (2013 (Offline) - No. 10)
An unknown alcohol is treated with the “Lucas reagent” to determine whether the alcohol is primary,
secondary or tertiary. Which alcohol reacts fastest and by what mechanism:
tertiary alcohol by SN1
secondary alcohol by SN2
tertiary alcohol by SN2
secondary alcohol by SN1
Explication
Tertiary alcohols reacts fastest with lucas reagnet as the rate of reaction is directly proportional to the stability of carbocation formed in the reaction. Since most stable $${3^ \circ }$$ carbocation is formed in the reaction hence it will react fastest further tetriary alcohols appears to react by $${S_N}1$$ mechanism.
_en_10_1.png)