Which of the following types of ethers cannot be sythesized by Williamson synthesis ?

Which of the following types of ethers cannot be sythesized by Williamson synthesis ?
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Which of the following types of ethers cannot be sythesized by Williamson synthesis ? A. `H_(3)C-overset(CH_(3)) ... 5)-O-C_(6)H_(5)` D. None of these
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