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Question

Which alcohol produces turbidity with Lucas reagent most slowly?


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Solution

Lucas test

  • Lucas test is used to differentiate primary, secondary and tertiary alcohol. The reaction that occurs in the Lucas test can be seen as a nucleophilic substitution reaction.
  • HCl in the presence of anhydrous zinc chloride to form chloroalkanes.
  • The alcohols are soluble in the Lucas reagent whereas the resulting chloroalkanes are not soluble. Thus, the formation of chloroalkanes is indicated by the appearance of cloudiness.
  • Tertiary alcohols give an immediate appearance of turbidity.
  • Appearances of cloudiness after a few minutes in case of secondary alcohols.
  • Primary alcohols do not give turbidity.

Describe Lucas test used to distinguish Primary, Secondary and Tertiary  alcohols. - Sarthaks eConnect | Largest Online Education Community

Hence secondary alcohol produces turbidity with Lucas reagent most slowly.


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