Which of the following shows the Lucas test i | vedclass

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(D) The Lucas test involves the reaction of an alcohol with Lucas reagent $(conc. \ HCl + ZnCl_2)$.It proceeds via an $S_N1$ mechanism,where the rate-

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$Ph-C(Ph)_2-OH$

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(D) The Lucas test involves the reaction of an alcohol with Lucas reagent $(conc. \ HCl + ZnCl_2)$.It proceeds via an $S_N1$ mechanism,where the rate-determining step is the formation of a carbocation.Alcohols that form highly stable carbocations react instantaneously with the Lucas reagent.Option $D$ is $Ph-C(Ph)_2-OH$,which is a tertiary alcohol. Upon protonation and loss of water,it forms a triphenylmethyl carbocation $(Ph_3C^+)$.This carbocation is exceptionally stable due to extensive resonance stabilization by three phenyl rings.Therefore,it reacts instantaneously with the Lucas reagent.

Which of the following shows the Lucas test instantaneously?

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For the above dehydration reaction,the rate of reaction will be:

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