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**Williamson's synthesis** of ethers couples an alkoxide with

AAn alkyl halide
BAn alcohol directly
CAn aldehyde
DA carboxylic acid
Answer & Solution
Correct answer: A. An alkyl halide
$RO^-Na^+ + R'X \to ROR' + NaX$. The alkoxide is the nucleophile, the alkyl halide is the electrophile.
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