The relative rate of acid-catalyzed dehydrati | vedclass

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(B) The rate of acid-catalyzed dehydration of alcohols depends on the stability of the carbocation intermediate formed after the loss of water. The mo

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$ (c) > (d) > (a) > (b) $

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(B) The rate of acid-catalyzed dehydration of alcohols depends on the stability of the carbocation intermediate formed after the loss of water. The more stable the carbocation,the faster the rate of dehydration.$(a)$ Forms a secondary benzylic carbocation: $Ph-CH(CH_3)-CH^+(CH_3)$.$(b)$ Forms a primary carbocation: $Ph-CH(CH_3)-CH_2-CH_2^+$.$(c)$ Forms a tertiary benzylic carbocation: $Ph-C^+(CH_3)-CH_2-CH_3$.$(d)$ Forms a tertiary carbocation: $Ph-C(CH_3)_2-CH_2^+$. (Note: This is a tertiary carbocation but not benzylic).Comparing stability: Tertiary benzylic $(c)$ > Tertiary $(d)$ > Secondary benzylic $(a)$ > Primary $(b)$.Therefore,the order of relative rates is $(c) > (d) > (a) > (b)$.

The relative rate of acid-catalyzed dehydration of the following alcohols would be:

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