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  4. R-OH + HX arrow RX + H2O. the reactivity of alcohols is

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Q. $R-OH + HX \rightarrow RX + H_2O$. the reactivity of alcohols is

Alcohols Phenols and Ethers

Solution:

The reaction $R - OH + HX \rightarrow RX + H _{2} O$ is a nucleophilic substitution reaction where the reactivity of $R - OH$ will depend upon the stability of carbocation that is formed during the reaction via $S _{ N } 1$ mechanism.
Tertiary carbocations are more stable due to + Inductive effect of alkyl groups then is secondary and least stable is primary carbocation. The reactivity of alcohols will follow the order Tertiary alcohol > secondary alcohol > primary alcohol