The correct order of the rate of acid-mediate | vedclass

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(D) The rate of acid-catalyzed dehydration of alcohols depends on the stability of the carbocation intermediate formed during the reaction. The stabil

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$III > IV > II > I$

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(D) The rate of acid-catalyzed dehydration of alcohols depends on the stability of the carbocation intermediate formed during the reaction. The stability order of carbocations is $3^\circ > 2^\circ > 1^\circ$.Let us analyze the carbocations formed from each alcohol:$(I)$ $CH_3CH_2CH_2CH_2OH$ forms a $1^\circ$ carbocation: $CH_3CH_2CH_2CH_2^+$.$(II)$ $CH_3-CH(CH_3)-CH_2OH$ forms a $1^\circ$ carbocation: $CH_3-CH(CH_3)-CH_2^+$,which can rearrange to a more stable $2^\circ$ carbocation.$(III)$ $CH_3-C(CH_3)_2-OH$ forms a $3^\circ$ carbocation: $CH_3-C^+(CH_3)_2$.$(IV)$ $CH_3-CH_2-CH(OH)-CH_3$ forms a $2^\circ$ carbocation: $CH_3-CH_2-CH^+-CH_3$.Comparing the stability: The $3^\circ$ carbocation $(III)$ is the most stable,followed by the $2^\circ$ carbocation $(IV)$. Between the two $1^\circ$ carbocations,$(II)$ can undergo rearrangement to form a more stable carbocation,making it more reactive than the primary carbocation $(I)$.Thus,the order of reactivity is $III > IV > II > I$.

The correct order of the rate of acid-mediated dehydration reaction of the following compounds is:

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