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  4. The order of reactivity of the following alcohols towards conc. HCl is

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Q. The order of reactivity of the following alcohols towards conc. $HCl$ is
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Alcohols Phenols and Ethers

Solution:

The order of reactivity depends upon the stability of carbocations formed. The relative stability of the carbocations follows the order:

$Ph \overset{+}{C} H _{2} > CH _{3} \overset{+}{C}HCH _{3}> FCH _{2} CH _{2}\overset{+}{ C}HCH _{3}> FCH _{2} \overset{+}{C}HCH _{3}$

Therefore, the order of reactivity of corresponding alcohols follows the order : $( IV > III > II > I )$