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Illustrate with example the limitations of Williamson synthesis for the preparation of certain types of ethers.

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The reaction of Williamson synthesis involves SN2 attack of an alkoxide ion on a primary alkyl halide

But if secondary or tertiary alkyl halides, then elimination would compete over substitution. As a result, alkenes would be produced. This is because alkoxides are nucleophiles as well as strong bases. Hence they react with alkyl halides, which results in an elimination reaction.

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