Which of the following ethers cannot be produ | vedclass

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(D) The Williamson ether synthesis involves the $S_N2$ attack of an alkoxide ion on an alkyl halide. This reaction fails if:$1.$ The alkyl halide is t

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All of these

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(D) The Williamson ether synthesis involves the $S_N2$ attack of an alkoxide ion on an alkyl halide. This reaction fails if:$1.$ The alkyl halide is tertiary (elimination occurs instead).$2.$ The halide is attached to an $sp^2$ or $sp$ hybridized carbon (like vinyl,aryl,or alkynyl halides),as these are unreactive towards $S_N2$ displacement.In option $(a)$,the structure $CH_3-C(CH_3)_2-O-CH=CH_2$ requires either a tertiary halide or a vinyl halide,both of which are unsuitable for $S_N2$.In option $(b)$,$Ph-O-Ph$ (diphenyl ether) requires an aryl halide,which is unreactive towards $S_N2$.In option $(c)$,$CH \equiv C-O-CH=CH_2$ involves alkynyl and vinyl groups,which are also unreactive.Therefore,none of these ethers can be prepared by this method.

Which of the following ethers cannot be produced by Williamson ether synthesis?

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