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Alcohols, Phenols, and Ethers — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryAlcohols, Phenols, and Ethers1 Mark
Question
Which of the following reactions is possible?
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Answer

Six types of ethers cannot be prepared by Williamson's synthesis.
Not feasible, $RX = 3^\circ , \text{RONa}= 3^\circ$
Not feasible,$ RX = 2^\circ , \text{RONa} = 2^\circ$
Not feasible$, \text{ArX},$
Feasible,$ RX = 1^\circ , \text{ArONa}$

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