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One of the principal ways to prepare ethers is the Williamson ether synthesis. In this reaction, an alkoxide ion is allowed to react with an alkyl halide (R-X) or alkyl tosylate (R-OTs). Select the appropriate answers from each dropdown to correctly complete these statements about the Williamson ether synthesis.

The Williamson ether synthesis is an
Select Option $\rm {S}_\rm {N}1$$\rm {S}_\rm {N}2$$\rm{E1}$$\rm{E2}$
reaction. The alkoxide ion serves as the
Select Option nucleophilebasesolvent
. The alkyl halide or tosylate must be a
Select Option tertiary or arylsecondary or tertiaryprimary or secondarymethyl or primary
substrate for the reaction to be favored.
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