What is the action of following reagent on ethyl alcohol 2)Sodium bromide and sulphuric acid
Answers
The Lucas reagent is an aqueous solution of strong acid (HCl) and zinc chloride (ZnCl2). Primary alcohols such as ethanol react with Lucas reagent very slowly on heating to give alkyl halide i.e., chloro-ethane.
EthanolCH3CH2OH+Conc.HCl→AnhydrousZnCl2ChloroethaneCH3CH2Cl+H2O.
(b) Ethanol when refluxed with PCl5 forms ethyl chloride.
EthanolCH3CH2OH+pentachloridePhosphorusPCl5→EthylchlorideCH3CH2Cl+HCl+oxychloridePhosphorusPOCl3
(c) Alkyl bromides are prepared by the action of bromine in presence of red phosphorus on alcohols in situ. In this reaction phosphorus tribromide is formed as an intermediate which in turn reacts with ethanol and forms corresponding alkyl bromide, i.e., ethyl bromide.
2P+3Br2→tribromide
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