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This is a mixture of concentrated hydrochloric acid and anhydrous zinc chloride (which acts as a catalyst). To prepare, mix 136.29 g of anhydrous zinc chloride (ZnCl2) with 105 g of concentrated hydrochloric acid (HCl). Place beaker in an ice bath, due to the exothermic reaction. Stir with a glass rod until all ZnCl2 is dissolved.
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ViviLucas reagent is a solution of anhydrous zinc chloride in concentrated hydrochloric acid. It is used to test for the presence of alcohols by converting them into alkyl chlorides. The reaction with Lucas reagent forms a cloudy solution or a precipitate when a primary or secondary alcohol is present.
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What is the result when a Lucas test is done on a Phenol?
A positive Lucas test on phenol would indicate that phenol is a strong enough acid to react with Lucas reagent (a mixture of concentrated hydrochloric acid and zinc chloride) to form a cloudy solution or a precipitate. This reaction distinguishes phenol from other alcohols that do not react with the Lucas reagent.
What is Lukas's reagent?
Lukas's reagent is a solution used in the laboratory to test for the presence of pentoses, a type of sugar. It contains sulfuric acid, vanillin, and phosphotungstic acid. When the reagent is added to a sample containing pentoses, a red color develops.
Lucas' reagent reaction with 3-methyl-1-hexanol?
In the Lucas reagent test, 3-methyl-1-hexanol would react through an SN1 mechanism where the hydroxyl group is replaced by a chlorine atom, forming 3-chloro-3-methylhexane. The reaction rate depends on the stability of the carbocation intermediate, which for secondary alcohols like 3-methyl-1-hexanol is faster compared to primary alcohols.
What is the reaction for 2-butanol with the lucas reagent?
2-butanol reacts with Lucas reagent (conc. HCl and ZnCl2) to form a turbidity or a cloudy appearance immediately, indicating a positive result for the presence of a primary or secondary alcohol. This reaction occurs due to the formation of an alkyl chloride, which is insoluble in water and causes the turbidity.
What is a reagent strip?
The reagent strip is a strip of paper impregnated with a specific chemical reagent for a chemical determination.
