Which of the reaction can be employed for the preparation of unsymmetrical ether ?

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Dehydration of alcohols

Dehydration of carboxylic acid

Williamson’s synthesis

Dehydrogenation of alcohols

answer is B.

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Detailed Solution

Dehydration of carboxylic acid is the esterification, which involves treating a carboxylic acid with an alcohol to give an ester.
RCO₂H + R′OH ⇌ RCO₂R′ + H₂O
Williamson's synthesis is an important laboratory method for the preparation of
symmetrical and unsymmetrical ethers.
In this method, an alkyl halide is allowed to react with sodium alkoxide.
$R - X + R' - O^{-} {Na}^{+} \to R - O - R^{'} + NaX$
Dehydration of alcohol is defined as a reaction in which alcohol reacts with protic acid to lose water molecules and forms alkenes.
Primary alcohols give aldehydes upon catalytic dehydrogenation, secondary alcohols give ketones, and tertiary alcohols give alkene.