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(B) Williamson ether synthesis involves the reaction of an alkoxide ion with an alkyl halide via an $S_N2$ mechanism. For effective synthesis,the alky

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$C_6H_5-O-CH_3$

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(B) Williamson ether synthesis involves the reaction of an alkoxide ion with an alkyl halide via an $S_N2$ mechanism. For effective synthesis,the alkyl halide must be primary $(1^\circ)$ to avoid competing elimination reactions. In option $B$,the reaction between sodium phenoxide $(C_6H_5ONa)$ and methyl iodide $(CH_3I)$ is highly effective because $CH_3I$ is a primary alkyl halide and does not undergo elimination. Option $A$ is not possible because aryl halides do not undergo $S_N2$ reactions. Option $C$ involves a tertiary alkyl group,which would lead to elimination (forming an alkene) rather than substitution. Option $D$ involves a vinyl halide,which is unreactive towards $S_N2$ substitution.

Which of the following can be prepared effectively by Williamson ether synthesis?

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