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Chapter 4: Problem 36

Lucas reagent is (a) anhy. \(\mathrm{AlCl}_{3}\) and conc.HCl (b) anhy.ZnCl \(_{2}\) and conc.HCl (c) Zinc amalgam and conc.HCl (d) \(\mathrm{H}_{2} \mathrm{~N}-\mathrm{NH}_{2}\) and \(\mathrm{KOH}\)

Short Answer

Expert verified
(a) anhy. AlCl₃ and conc.HCl (b) anhy.ZnCl₂ and conc.HCl (c) Zinc amalgam and conc.HCl (d) H₂N-NH₂ and KOH Answer: (b) anhy.ZnCl₂ and conc.HCl

Step by step solution

01

Recall the definition of Lucas reagent

Lucas reagent is a solution of anhydrous zinc chloride (ZnCl₂) in concentrated hydrochloric acid (HCl). It is used in organic chemistry as a reagent to test and differentiate between primary, secondary, and tertiary alcohols by observing the formation of alkyl halides.
02

Match the correct option for Lucas reagent

Now that we know the definition of Lucas reagent, let's match it with the given options: (a) anhy. \(\mathrm{AlCl}_{3}\) and conc.HCl: This option represents anhydrous aluminum chloride combined with hydrochloric acid, which is not the correct composition of Lucas reagent. (b) anhy.ZnCl \(_{2}\) and conc.HCl: This option represents anhydrous zinc chloride combined with hydrochloric acid, which matches the correct composition of Lucas reagent. (c) Zinc amalgam and conc.HCl: This option represents zinc amalgam combined with hydrochloric acid, which is not the correct composition of Lucas reagent. (d) \(\mathrm{H}_{2} \mathrm{~N}-\mathrm{NH}_{2}\) and \(\mathrm{KOH}\): This option represents hydrazine combined with potassium hydroxide, which is not the correct composition of Lucas reagent.
03

Choose the correct answer

From our analysis, the correct answer is: (b) anhy.ZnCl \(_{2}\) and conc.HCl, as this matches the definition and composition of Lucas reagent.

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Most popular questions from this chapter

The product \(\mathrm{P}\) in the following reaction is \(\mathrm{ClCH}_{2}-\mathrm{CH}_{2} \mathrm{OH} \stackrel{\mathrm{OH}^{-}}{\longrightarrow} \mathrm{P}\)

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