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(D) The reactivity of alcohols with haloacids $(HX)$ follows the order: $3^{\circ} > 2^{\circ} > 1^{\circ}$.This is because the reaction proceeds via

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$3-$methylpentan$-3-$ol

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(D) The reactivity of alcohols with haloacids $(HX)$ follows the order: $3^{\circ} > 2^{\circ} > 1^{\circ}$.This is because the reaction proceeds via the formation of a carbocation intermediate,and the stability of the carbocation follows the order: $3^{\circ} > 2^{\circ} > 1^{\circ}$.Analyzing the given structures:$(A)$ $CH_3CH_2C(CH_3)(OH)CH_3$ is a $3^{\circ}$ alcohol.$(B)$ $CH_3CH_2CH(OH)CH_2CH_3$ is a $2^{\circ}$ alcohol.$(C)$ $CH_3CH_2CH_2CH(OH)CH_3$ is a $2^{\circ}$ alcohol.$(D)$ $CH_3CH_2C(OH)(CH_3)CH_2CH_3$ is a $3^{\circ}$ alcohol.Both $(A)$ and $(D)$ are tertiary alcohols. However,$(D)$ is a more substituted tertiary alcohol ($3$-methylpentan$-3-$ol) compared to $(A)$ ($2$-methylbutan$-2-$ol),making the carbocation formed from $(D)$ slightly more stable due to increased hyperconjugation and inductive effects. Thus,$(D)$ reacts fastest.

Which among the following compounds reacts fastest with $HBr$?

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