Select all the syntheses that produce the pictured other in better than 50% yield.
2-butanol treated with sodium hydride followed by ethyl chloride.
Ethanol treated with sodium hydride followed by 2-chlorobutane.
A 50/50 mixture of ethanol and 2-butanol heated with concentrated sulfuric acid.
2-butanol treated with sodium hydride followed by 2-chloropropane.
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