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NEET CHEMISTRYAlcohols, Phenols and EthersEasy

Question

Which of the following is the most preferred method for preparing pure alkyl chlorides from alcohols?

A

R-OH+HCl→ZnCl2R-Cl+H2O\text{R-OH} + \text{HCl} \xrightarrow{\text{ZnCl}_2} \text{R-Cl} + \text{H}_2\text{O}

B

R-OH+PCl5→R-Cl+POCl3+HCl\text{R-OH} + \text{PCl}_5 \rightarrow \text{R-Cl} + \text{POCl}_3 + \text{HCl}

C

R-OH+SOCl2→R-Cl+SO2+HCl\text{R-OH} + \text{SOCl}_2 \rightarrow \text{R-Cl} + \text{SO}_2 + \text{HCl}

D

R-OH+PCl3→R-Cl+H3PO3\text{R-OH} + \text{PCl}_3 \rightarrow \text{R-Cl} + \text{H}_3\text{PO}_3

Step-by-Step Solution

The reaction of an alcohol with thionyl chloride (SOCl2\text{SOCl}_2) is the most preferred method for preparing alkyl chlorides. This is because the byproducts of this reaction are sulphur dioxide (SO2\text{SO}_2) and hydrogen chloride (HCl\text{HCl}), both of which are gases that easily escape from the reaction mixture, leaving behind pure alkyl chloride .

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Alcohols, Phenols and Ethers. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYAlcohols, Phenols and Ethersfollowingpreferredmethodpreparingchlorides

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