Question:

Preparation of ethers by reacting sodium alkoxide with alkyl halides is called

Updated On: Jul 6, 2023
  • Kolbes synthesis
  • Williamsons synthesis
  • Wurtz synthesis
  • Cannizzarro reaction
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The Correct Option is B

Solution and Explanation

The reaction of alkoxide ion with alkyl halide to form ether is known as Williamson's synthesis. Williamson's synthesis is used to prepare diethyl ether. This is the industrial process for making ethers. Sodium ethoxide is heated with ethyl iodide to form diethyl ether. $C _{2} H _{5} ONa + C _{2} H _{5} I \rightarrow C _{2} H _{5}- O - C _{2} H _{5}+ NaI$
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Concepts Used:

Preparation

Preparation of Aldehydes:

  • In the presence of palladium catalyst spread on barium sulfate, Acid chlorides are reduced to aldehydes with hydrogen .
  • This is known as Rosenmund reduction. It is mostly used for the preparation of aromatic aldehydes.

Preparation of Ketones:

  • Acid chlorides on reaction with dialkyl cadmium form ketones. Grignard reagents are used in the preparation of Dialkyl cadmium.
  • 2R-Mg-X + CdCl2 → R2Cd + 2 Mg(X)Cl
  • 2RCOCl + R2Cd → 2R-CO-R + CdCl2
  • The mixed ketones are prepared very conveniently.

Preparation of Carboxylic Acids:

  • Primary alcohols are readily oxidized to carboxylic acids with common oxidizing agents such as potassium permanganate in neutral acidic or alkaline media or by potassium dichromate and chromium trioxide in acidic media.
  • RCH2OH → RCOOH
  • CH3(CH2)8CH2OH → CH3(CH2)8COOH

Read More: Aldehydes, Ketone, and Carboxylic Acids